UK MJFN4MP/A · 42mm · Aluminium · Space Grey · GPS
Apple Watch Series 12 in the manufacturer's 42mm Space Grey aluminium case configuration, identified by MJFN4MP/A.
Specifications checked 19 Oct 2026.
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Manufacturer specificationsUK MEHV4MP/A · 40mm · Aluminium · Starlight · GPS
Apple Watch SE 3 in the manufacturer's 40mm Starlight aluminium case configuration, identified by MEHV4MP/A.
Specifications checked 19 Oct 2026.
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Differences first. Select a topic for its graphic, sources and conditions.
Check the exact configuration and source conditions for your use.
Manufacturer specification
Manufacturer specification · Apple Watch SE 3 Ion-X glass is 4x more crack resistant than Apple Watch SE 2.
Check the exact configuration. Manufacturer specifications describe the listed variant. Confirm compatibility and the seller’s exact model before buying; no overall winner is inferred from incomplete evidence.
9 verified differences, most decision-relevant first. 7 are also drawn in Visual facts above. Missing information stays separate.
Manufacturer specification · Apple Watch SE 3 Ion-X glass is 4x more crack resistant than Apple Watch SE 2.
Apple UK — Watch SE 3 technical specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · The Blood Oxygen app is for wellness purposes only and not for medical use. Measurements are calculated and viewed on iPhone in the Health app. The temperature sensing feature is not intended for medical use. Temperature sensing is available on Apple Watch Series 8 and later, Apple Watch SE 3 and all Apple Watch Ultra models.
Apple UK — Watch Series 12 technical specificationsManufacturer specification · The temperature sensing feature is not intended for medical use. Temperature sensing is available on Apple Watch Series 8 and later, Apple Watch SE 3 and all Apple Watch Ultra models.
Apple UK — Watch SE 3 technical specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · GPS selected; cellular-only model groups and radio bands are excluded. Ultra Wideband availability varies by region. For more information, visit support.apple.com/en-gb/109512 . Any card used in Apple Pay is offered by the card issuer. To use Apple Pay you need a supported card from a participating card issuer. To check if your card is compatible with Apple Pay, contact your card issuer. Apple Pay is not available in all markets. View Apple Pay countries and regions . Data plan required. 5G is available in selected markets and through selected network providers. Speeds vary based on site conditions and network. For details on 5G support, contact your provider and see apple.com/uk/watch/cellular . Wireless service plan required for mobile service. Contact your service provider for more details. Connection may vary based on network availability. Check apple.com/uk/watch/cellular for participating network providers and eligibility. See support.apple.com/en‑gb/HT207578 for additional setup instructions. Not all features will be available if the Apple Watch is set up through Apple Watch For Your Kids. Check support.apple.com/en‑gb/109036 for details. Wireless service plan required for mobile service. Check apple.com/uk/watch/cellular for participating network providers and eligibility.
Apple UK — literal MJFN4MP/A case selectionApple UK — Watch Series 12 technical specificationsManufacturer specification · GPS selected; cellular-only model groups and radio bands are excluded. Any card used in Apple Pay is offered by the card issuer. To use Apple Pay you need a supported card from a participating card issuer. To check if your card is compatible with Apple Pay, contact your card issuer. Apple Pay is not available in all markets. View Apple Pay countries and regions . Data plan required. 5G is available in selected markets and through selected network providers. Speeds vary based on site conditions and network. For details on 5G support, contact your provider and see apple.com/uk/watch/cellular . Wireless service plan required for mobile service. Contact your service provider for more details. Connection may vary based on network availability. Check apple.com/uk/watch/cellular for participating network providers and eligibility. See support.apple.com/en‑gb/HT207578 for additional setup instructions. Not all features will be available if the Apple Watch is set up through Apple Watch For Your Kids. Check support.apple.com/en‑gb/109036 for details. Wireless service plan required for mobile service. Check apple.com/uk/watch/cellular for participating network providers and eligibility.
Apple UK — literal MEHV4MP/A case selectionApple UK — Watch SE 3 technical specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · All‑day battery life testing includes: 300 time checks, 90 notifications, 15 minutes of app use, a 60‑minute workout with music playback from Apple Watch via Bluetooth, and 6 hours of sleep tracking over the course of 24 hours; Apple Watch Series 12 (GPS) usage includes connection to iPhone via Bluetooth during the entire 24‑hour test; Apple Watch Series 12 (GPS + Cellular) usage includes a total of 4 hours of cellular connection and 20 hours of connection to iPhone via Bluetooth over the course of 24 hours. Battery life testing in Low Power Mode includes: 530 time checks, 160 notifications, 26 minutes of app use, a 60‑minute workout with music playback from Apple Watch via Bluetooth, and 6 hours of sleep tracking over the course of 38 hours; Apple Watch Series 12 (GPS) usage includes connection to iPhone via Bluetooth during the entire 38‑hour test; Apple Watch Series 12 (GPS + Cellular) usage includes on‑demand cellular connection and 30 hours of connection to iPhone via Bluetooth over the course of 38 hours. Testing conducted by Apple in July and August 2026 using pre‑production Apple Watch Series 12 (GPS) and Apple Watch Series 12 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary. Workout tested without iPhone and with heart rate sensor on during outdoor run workout sessions. Testing conducted by Apple in July and August 2026 using pre‑production Apple Watch Series 12 (GPS) and Apple Watch Series 12 (GPS + Cellular); all devices tested with pre‑release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary. Charge times are from 0–80% and 0–100% using the included Apple Watch Magnetic Fast Charger to USB‑C Cable. Testing conducted by Apple in July and August 2026 using pre‑production Apple Watch Series 12 (GPS) and Apple Watch Series 12 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software, pre‑production Apple Watch Magnetic Fast Charger to USB‑C Cable (Model A3277) and Apple 20W USB‑C Power Adapter (Model A2305). Fast‑charge testing conducted with drained Apple Watch units. Times measured from the appearance of the Apple logo as the unit started up. Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary. Testing conducted by Apple in July and August 2026 using pre‑production Apple Watch Series 12 (GPS) and Apple Watch Series 12 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software, pre‑production Apple Watch Magnetic Fast Charger to USB‑C Cable (Model A3277) and Apple 20W USB‑C Power Adapter (Model A2305). Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary.
Apple UK — Watch Series 12 technical specificationsManufacturer specification · All‑day battery life is based on the following use: 300 time checks, 90 notifications, 15 minutes of app use and a 60‑minute workout with music playback from Apple Watch via Bluetooth, over the course of 18 hours; Apple Watch SE 3 (GPS) usage includes connection to iPhone via Bluetooth during the entire 18‑hour test; Apple Watch SE 3 (GPS + Cellular) usage includes a total of 4 hours of cellular connection and 14 hours of connection to iPhone via Bluetooth over the course of 18 hours. Battery life in Low Power Mode including sleep tracking is based on the following use: 430 time checks, 130 notifications, 20 minutes of app use, a 60‑minute workout with music playback from Apple Watch via Bluetooth, and 6 hours of sleep tracking over the course of 32 hours; Apple Watch SE 3 (GPS) usage includes connection to iPhone via Bluetooth during the entire 32‑hour test; Apple Watch SE 3 (GPS + Cellular) usage includes on‑demand cellular connection and 24 hours of connection to iPhone via Bluetooth over the course of 32 hours. Testing conducted by Apple in July and August 2025 using pre‑production Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary. Workout tested without iPhone and with heart rate sensor on during outdoor run workout sessions. Testing conducted by Apple in July and August 2025 using pre‑production Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular); all devices tested with pre‑release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary. Charge times are from 0–80% and 0–100% using the included Apple Watch Magnetic Fast Charger to USB‑C Cable. Testing conducted by Apple in July and August 2025 using pre‑production Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software, Apple Watch Magnetic Fast Charger to USB‑C Cable (Model A2515) and Apple 20W USB‑C Power Adapter (Model A2305). Fast-charge testing conducted with drained Apple Watch units. Times measured from the appearance of the Apple logo as the unit started up. Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary. Testing conducted by Apple in July and August 2025 using pre‑production Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software, Apple Watch Magnetic Fast Charger to USB‑C Cable (Model A2515) and Apple 20W USB‑C Power Adapter (Model A2305). Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary.
Apple UK — Watch SE 3 technical specificationsManufacturer claims for the stated mode and equipment. Read each test condition; this is not measured everyday battery life.
Manufacturer specification · Nominal store option; the separately listed physical case dimensions can differ by material.
Apple UK — literal MJFN4MP/A case selectionManufacturer specification · Nominal store option; the separately listed physical case dimensions can differ by material.
Apple UK — literal MEHV4MP/A case selectionCheck the exact configuration and source conditions for your use.
Manufacturer specification · Manufacturer's labelled size/material column. No chosen strap dimensions are included.
Apple UK — Watch Series 12 technical specificationsManufacturer specification · Manufacturer's labelled size/material column. No chosen strap dimensions are included.
Apple UK — Watch SE 3 technical specificationsA size or weight trade-off; it does not establish the better product.
Manufacturer specification · Apple Watch Series 12 has a water resistance rating of 50 metres under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean or snorkelling to a depth of 6 metres. It should not be used for scuba diving, waterskiing or other high-velocity water sports. Water resistance is not a permanent condition and can diminish over time. For more information, see support.apple.com/en-gb/109522 . Apple Watch Series 12 is rated IP6X dust resistant.
Apple UK — Watch Series 12 technical specificationsManufacturer specification · Apple Watch SE 3 has a water resistance rating of 50 metres under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean. It should not be used for scuba diving, waterskiing or other high-velocity water sports, or submersion below shallow depth. Water resistance is not a permanent condition and can diminish over time. For more information, see support.apple.com/en-gb/109522 .
Apple UK — Watch SE 3 technical specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Audio Intelligence includes Live Rewind, Siri Recap, Sound Recognition, and faster Shazam and requires Apple Watch Series 12 or Apple Watch Ultra 4. Live Rewind and Siri Recap will be available in beta in late 2026 and require an Apple Intelligence–enabled iPhone 16 or later (excluding iPhone 16e). Will be available in English to start and will not initially be available in the EU. Certain Audio Intelligence features that rely on server-side models are subject to daily usage limits, including but not limited to Live Rewind and Siri Recap. For more information, visit support.apple.com/en-gb/148354 .
Apple UK — Watch Series 12 technical specificationsDifferent hardware. A chip name or generation does not quantify real-world performance.
Check the exact configuration and source conditions for your use.
Manufacturer specification · Manufacturer row: Weight (aluminium, GPS). The cited table does not establish the combined mass with a selected strap.
Apple UK — Watch Series 12 technical specificationsManufacturer specification · Manufacturer row: Weight (GPS). The cited table does not establish the combined mass with a selected strap.
Apple UK — Watch SE 3 technical specificationsA size or weight trade-off; it does not establish the better product.
Strap selection is not part of this exact case identifier. · Manufacturer specification · This record identifies the literal watch-case SKU. The manufacturer's configurable strap has no selection in this record; strap style, size, bundle identifier and combined mass remain unspecified.
Apple UK — Watch Series 12 technical specificationsStrap selection is not part of this exact case identifier. · Manufacturer specification · This record identifies the literal watch-case SKU. The manufacturer's configurable strap has no selection in this record; strap style, size, bundle identifier and combined mass remain unspecified.
Apple UK — Watch SE 3 technical specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
6 shared fields have the same recorded value.
| Specification | Apple Watch Series 12 | Apple Watch SE 3 |
|---|---|---|
DisplayDifferent SourcesApple Watch SE 3 Manufacturer specification · Apple Watch SE 3 Ion-X glass is 4x more crack resistant than Apple Watch SE 2. Apple UK — Watch SE 3 technical specifications | Always-On Retina display with wide-angle OLEDs and LTPO3; 1Hz refresh; Active area (42mm): 374x446 pixels, 326 pixels per inch; Ceramic Shield 2 (aluminium cases); 2,000 nits peak brightness; 1 nit minimum brightness | Always-On Retina display with OLED and LTPO; Tough Ion-X front glass with 4x crack resistance; 1,000 nits peak brightness; 2 nits minimum brightness; 326 pixels per inch |
Active display resolutionDifferent Sources | 374 × 446 | 324 × 394 |
Controls SourcesApple Watch Series 12 Manufacturer specification · Apple Intelligence is available with Siri and device language set to Chinese (Simplified), Chinese (Traditional), Danish, Dutch, English, French, German, Italian, Japanese, Korean, Norwegian, Portuguese, Spanish, Swedish, Turkish or Vietnamese. Some features may not be available in all regions or languages. Some devices may not be available in all regions. Siri AI is available in beta in watchOS 27 and requires an Apple Intelligence–enabled device set to a supported language. Available in English to start. Siri AI will not be initially available in the EU on watchOS. Certain Apple Intelligence features that rely on server-side models are subject to daily usage limits, including but not limited to Siri AI. Daily limits may vary by feature, request complexity, system demand, system policies and other factors. Expanded access to such features will be available for a fee in the future. Use of these features is subject to the Apple Intelligence Terms and Conditions. Learn more at apple.com/uk/apple-intelligence . Apple UK — Watch Series 12 technical specificationsApple Watch SE 3 Manufacturer specification · Apple Intelligence is available with Siri and device language set to Chinese (Simplified), Chinese (Traditional), Danish, Dutch, English, French, German, Italian, Japanese, Korean, Norwegian, Portuguese, Spanish, Swedish, Turkish or Vietnamese. Some features may not be available in all regions or languages. Some devices may not be available in all regions. Siri AI is available in beta in watchOS 27 and requires an Apple Intelligence–enabled device set to a supported language. Available in English to start. Siri AI will not be initially available in the EU on watchOS. Certain Apple Intelligence features that rely on server-side models are subject to daily usage limits, including but not limited to Siri AI. Daily limits may vary by feature, request complexity, system demand, system policies and other factors. Expanded access to such features will be available for a fee in the future. Use of these features is subject to the Apple Intelligence Terms and Conditions. Learn more at apple.com/uk/apple-intelligence . Apple UK — Watch SE 3 technical specifications | Digital Crown with haptic feedback Side button Single tap, double tap and wrist flick gestures Siri powered by Apple Intelligence | Digital Crown with haptic feedback Side button Single tap, double tap and wrist flick gestures Siri powered by Apple Intelligence |
ChipsetDifferent SourcesApple Watch Series 12 Manufacturer specification · Audio Intelligence includes Live Rewind, Siri Recap, Sound Recognition, and faster Shazam and requires Apple Watch Series 12 or Apple Watch Ultra 4. Live Rewind and Siri Recap will be available in beta in late 2026 and require an Apple Intelligence–enabled iPhone 16 or later (excluding iPhone 16e). Will be available in English to start and will not initially be available in the EU. Certain Audio Intelligence features that rely on server-side models are subject to daily usage limits, including but not limited to Live Rewind and Siri Recap. For more information, visit support.apple.com/en-gb/148354 . Apple UK — Watch Series 12 technical specifications | S11 chip with 64-bit dual-core processor Audio Intelligence (Live Rewind, Siri Recap, Shazam, Sound Recognition) 4-core Neural Engine 64GB capacity | S10 chip with 64-bit dual core processor 4-core Neural Engine 64GB capacity |
SensorsDifferent SourcesApple Watch Series 12 Manufacturer specification · The Blood Oxygen app is for wellness purposes only and not for medical use. Measurements are calculated and viewed on iPhone in the Health app. The temperature sensing feature is not intended for medical use. Temperature sensing is available on Apple Watch Series 8 and later, Apple Watch SE 3 and all Apple Watch Ultra models. Apple UK — Watch Series 12 technical specificationsApple Watch SE 3 Manufacturer specification · The temperature sensing feature is not intended for medical use. Temperature sensing is available on Apple Watch Series 8 and later, Apple Watch SE 3 and all Apple Watch Ultra models. Apple UK — Watch SE 3 technical specifications | Health Sensing System: third-generation electrical heart sensor, always-on optical heart sensor, blood oxygen sensor and temperature sensor Compass Always-on altimeter High-g accelerometer High dynamic range gyroscope Ambient light sensor Depth gauge to 6 metres Water temperature sensor | Second-generation optical heart sensor Temperature sensor Compass Always-on altimeter High-g accelerometer High dynamic range gyroscope Ambient light sensor |
Audio Sources | Speaker Microphone Media playback | Speaker Microphone Media playback |
BatteryDifferent SourcesApple Watch Series 12 Manufacturer specification · All‑day battery life testing includes: 300 time checks, 90 notifications, 15 minutes of app use, a 60‑minute workout with music playback from Apple Watch via Bluetooth, and 6 hours of sleep tracking over the course of 24 hours; Apple Watch Series 12 (GPS) usage includes connection to iPhone via Bluetooth during the entire 24‑hour test; Apple Watch Series 12 (GPS + Cellular) usage includes a total of 4 hours of cellular connection and 20 hours of connection to iPhone via Bluetooth over the course of 24 hours. Battery life testing in Low Power Mode includes: 530 time checks, 160 notifications, 26 minutes of app use, a 60‑minute workout with music playback from Apple Watch via Bluetooth, and 6 hours of sleep tracking over the course of 38 hours; Apple Watch Series 12 (GPS) usage includes connection to iPhone via Bluetooth during the entire 38‑hour test; Apple Watch Series 12 (GPS + Cellular) usage includes on‑demand cellular connection and 30 hours of connection to iPhone via Bluetooth over the course of 38 hours. Testing conducted by Apple in July and August 2026 using pre‑production Apple Watch Series 12 (GPS) and Apple Watch Series 12 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary. Workout tested without iPhone and with heart rate sensor on during outdoor run workout sessions. Testing conducted by Apple in July and August 2026 using pre‑production Apple Watch Series 12 (GPS) and Apple Watch Series 12 (GPS + Cellular); all devices tested with pre‑release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary. Charge times are from 0–80% and 0–100% using the included Apple Watch Magnetic Fast Charger to USB‑C Cable. Testing conducted by Apple in July and August 2026 using pre‑production Apple Watch Series 12 (GPS) and Apple Watch Series 12 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software, pre‑production Apple Watch Magnetic Fast Charger to USB‑C Cable (Model A3277) and Apple 20W USB‑C Power Adapter (Model A2305). Fast‑charge testing conducted with drained Apple Watch units. Times measured from the appearance of the Apple logo as the unit started up. Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary. Testing conducted by Apple in July and August 2026 using pre‑production Apple Watch Series 12 (GPS) and Apple Watch Series 12 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software, pre‑production Apple Watch Magnetic Fast Charger to USB‑C Cable (Model A3277) and Apple 20W USB‑C Power Adapter (Model A2305). Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary. Apple UK — Watch Series 12 technical specificationsApple Watch SE 3 Manufacturer specification · All‑day battery life is based on the following use: 300 time checks, 90 notifications, 15 minutes of app use and a 60‑minute workout with music playback from Apple Watch via Bluetooth, over the course of 18 hours; Apple Watch SE 3 (GPS) usage includes connection to iPhone via Bluetooth during the entire 18‑hour test; Apple Watch SE 3 (GPS + Cellular) usage includes a total of 4 hours of cellular connection and 14 hours of connection to iPhone via Bluetooth over the course of 18 hours. Battery life in Low Power Mode including sleep tracking is based on the following use: 430 time checks, 130 notifications, 20 minutes of app use, a 60‑minute workout with music playback from Apple Watch via Bluetooth, and 6 hours of sleep tracking over the course of 32 hours; Apple Watch SE 3 (GPS) usage includes connection to iPhone via Bluetooth during the entire 32‑hour test; Apple Watch SE 3 (GPS + Cellular) usage includes on‑demand cellular connection and 24 hours of connection to iPhone via Bluetooth over the course of 32 hours. Testing conducted by Apple in July and August 2025 using pre‑production Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary. Workout tested without iPhone and with heart rate sensor on during outdoor run workout sessions. Testing conducted by Apple in July and August 2025 using pre‑production Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular); all devices tested with pre‑release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary. Charge times are from 0–80% and 0–100% using the included Apple Watch Magnetic Fast Charger to USB‑C Cable. Testing conducted by Apple in July and August 2025 using pre‑production Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software, Apple Watch Magnetic Fast Charger to USB‑C Cable (Model A2515) and Apple 20W USB‑C Power Adapter (Model A2305). Fast-charge testing conducted with drained Apple Watch units. Times measured from the appearance of the Apple logo as the unit started up. Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary. Testing conducted by Apple in July and August 2025 using pre‑production Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular), each paired with an iPhone; all devices tested with pre‑release software, Apple Watch Magnetic Fast Charger to USB‑C Cable (Model A2515) and Apple 20W USB‑C Power Adapter (Model A2305). Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary. Apple UK — Watch SE 3 technical specifications | All-day battery life, up to 24 hours of normal use Up to 38 hours in Low Power Mode Up to 10 hours outdoor workout Built-in rechargeable lithium-ion battery Fast-charge capable Up to 80% charge in about 30 minutes 15 minutes for up to 12 hours of normal use 5 minutes for up to 10 hours of sleep tracking Learn more | All-day battery life, up to 18 hours of normal use Up to 32 hours in Low Power Mode Up to 7 hours outdoor workout Built-in rechargeable lithium-ion battery Fast-charge capable Up to 80% charge in about 45 minutes 15 minutes for up to 8 hours of normal use 8 minutes for up to 8 hours of sleep tracking Learn more |
ConnectionsDifferent SourcesApple Watch Series 12 Manufacturer specification · GPS selected; cellular-only model groups and radio bands are excluded. Ultra Wideband availability varies by region. For more information, visit support.apple.com/en-gb/109512 . Any card used in Apple Pay is offered by the card issuer. To use Apple Pay you need a supported card from a participating card issuer. To check if your card is compatible with Apple Pay, contact your card issuer. Apple Pay is not available in all markets. View Apple Pay countries and regions . Data plan required. 5G is available in selected markets and through selected network providers. Speeds vary based on site conditions and network. For details on 5G support, contact your provider and see apple.com/uk/watch/cellular . Wireless service plan required for mobile service. Contact your service provider for more details. Connection may vary based on network availability. Check apple.com/uk/watch/cellular for participating network providers and eligibility. See support.apple.com/en‑gb/HT207578 for additional setup instructions. Not all features will be available if the Apple Watch is set up through Apple Watch For Your Kids. Check support.apple.com/en‑gb/109036 for details. Wireless service plan required for mobile service. Check apple.com/uk/watch/cellular for participating network providers and eligibility. Apple UK — literal MJFN4MP/A case selectionApple UK — Watch Series 12 technical specificationsApple Watch SE 3 Manufacturer specification · GPS selected; cellular-only model groups and radio bands are excluded. Any card used in Apple Pay is offered by the card issuer. To use Apple Pay you need a supported card from a participating card issuer. To check if your card is compatible with Apple Pay, contact your card issuer. Apple Pay is not available in all markets. View Apple Pay countries and regions . Data plan required. 5G is available in selected markets and through selected network providers. Speeds vary based on site conditions and network. For details on 5G support, contact your provider and see apple.com/uk/watch/cellular . Wireless service plan required for mobile service. Contact your service provider for more details. Connection may vary based on network availability. Check apple.com/uk/watch/cellular for participating network providers and eligibility. See support.apple.com/en‑gb/HT207578 for additional setup instructions. Not all features will be available if the Apple Watch is set up through Apple Watch For Your Kids. Check support.apple.com/en‑gb/109036 for details. Wireless service plan required for mobile service. Check apple.com/uk/watch/cellular for participating network providers and eligibility. Apple UK — literal MEHV4MP/A case selectionApple UK — Watch SE 3 technical specifications | All models Support for 2.4GHz and 5GHz Wi-Fi networks Wi-Fi 4 (802.11n) Bluetooth 5.3 Precision L1 GPS (GPS, GLONASS, Galileo, QZSS and BeiDou) Second-generation Ultra Wideband chip Apple Pay GymKit | All models Support for 2.4GHz Wi-Fi networks Wi-Fi 4 (802.11n) Bluetooth 5.3 L1 GPS (GLONASS, Galileo, QZSS and BeiDou) Apple Pay GymKit |
Compatibility Sources | iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later | iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later |
Case sizeDifferent SourcesApple Watch Series 12 Manufacturer specification · Nominal store option; the separately listed physical case dimensions can differ by material. Apple UK — literal MJFN4MP/A case selectionApple Watch SE 3 Manufacturer specification · Nominal store option; the separately listed physical case dimensions can differ by material. Apple UK — literal MEHV4MP/A case selection | 42 mm | 40 mm |
DimensionsDifferent SourcesApple Watch Series 12 Manufacturer specification · Manufacturer's labelled size/material column. No chosen strap dimensions are included. Apple UK — Watch Series 12 technical specificationsApple Watch SE 3 Manufacturer specification · Manufacturer's labelled size/material column. No chosen strap dimensions are included. Apple UK — Watch SE 3 technical specifications | Height: 42 mm; Width: 37 mm; Depth: 9.7 mm | Height: 40 mm; Width: 34 mm; Depth: 10.7 mm |
WeightDifferent SourcesApple Watch Series 12 Manufacturer specification · Manufacturer row: Weight (aluminium, GPS). The cited table does not establish the combined mass with a selected strap. Apple UK — Watch Series 12 technical specificationsApple Watch SE 3 Manufacturer specification · Manufacturer row: Weight (GPS). The cited table does not establish the combined mass with a selected strap. Apple UK — Watch SE 3 technical specifications | 32.2 g | 26.3 g |
Manufacturer durability claimsDifferent SourcesApple Watch Series 12 Manufacturer specification · Apple Watch Series 12 has a water resistance rating of 50 metres under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean or snorkelling to a depth of 6 metres. It should not be used for scuba diving, waterskiing or other high-velocity water sports. Water resistance is not a permanent condition and can diminish over time. For more information, see support.apple.com/en-gb/109522 . Apple Watch Series 12 is rated IP6X dust resistant. Apple UK — Watch Series 12 technical specificationsApple Watch SE 3 Manufacturer specification · Apple Watch SE 3 has a water resistance rating of 50 metres under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean. It should not be used for scuba diving, waterskiing or other high-velocity water sports, or submersion below shallow depth. Water resistance is not a permanent condition and can diminish over time. For more information, see support.apple.com/en-gb/109522 . Apple UK — Watch SE 3 technical specifications | Water resistance 50m (swimproof) under ISO standard 22810:2010 Dust resistance IP6X | Water resistance 50m (swimproof) |
Manufacturer case material Sources | Aluminium | Aluminium |
ColourDifferent Sources | Space Grey | Starlight |
Operating conditions Sources | Operating temperature: 0° to 35° C (32° to 95° F) Non-operating storage temperature: -20° to 45° C (-4° to 113° F) Relative humidity: 5% to 90% non-condensing Operating altitude: 0 to 3,000 metres (0 to 10,000 feet) | Operating temperature: 0° to 35° C (32° to 95° F) Non-operating storage temperature: -20° to 45° C (-4° to 113° F) Relative humidity: 5% to 90% non-condensing Operating altitude: 0 to 3,000 metres (0 to 10,000 feet) |
Operating system SourcesApple Watch Series 12 Manufacturer specification · Exact installed watchOS version is not listed by this technical source. Apple UK — Watch Series 12 technical specificationsApple Watch SE 3 Manufacturer specification · Exact installed watchOS version is not listed by this technical source. Apple UK — Watch SE 3 technical specifications | watchOS | watchOS |
Strap configuration SourcesApple Watch Series 12 Strap selection is not part of this exact case identifier. · Manufacturer specification · This record identifies the literal watch-case SKU. The manufacturer's configurable strap has no selection in this record; strap style, size, bundle identifier and combined mass remain unspecified. Apple UK — Watch Series 12 technical specificationsApple Watch SE 3 Strap selection is not part of this exact case identifier. · Manufacturer specification · This record identifies the literal watch-case SKU. The manufacturer's configurable strap has no selection in this record; strap style, size, bundle identifier and combined mass remain unspecified. Apple UK — Watch SE 3 technical specifications | Not listed by the manufacturer | Not listed by the manufacturer |
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Closest smartwatches to this pair by shared key specifications. Not a popularity ranking.
Each record represents an explicitly checked model and configuration. Original import: 5 Sept 2026; this is not its verification date. This is not a list of current offers or a popularity ranking.
