Apple Watch SE MJKY4LW/A, 40mm
Apple Watch SE 3 is a 40mm GPS smartwatch with temperature sensing, sleep tracking, fall detection and 18-hour battery life.
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About this item
- Temperature sensing, sleep score and sleep apnoea notifications for health insights
- Tracks workouts from running to strength training, with real-time metrics and Workout Buddy
- Detects hard falls and severe car crashes and can connect you with emergency services
- 18-hour battery life, with up to 8 hours of charge in 15 minutes
- Siri AI assistant for questions, wellness tips and post-workout ideas
- GPS model works with your iPhone or Wi-Fi for texts, calls, music and notifications
Top Highlights
- Brand
- Apple Watch
- Model Name
- SE 3 GPS
- Model Number
- MJKY4LW/A
- Department
- Unisex
- Item Type
- Smart Watch
- Manufacturer
- Apple
- First Available
- 8 September 2026
- Release Year
- 2025
Features & Specs
- Display
- Digital
- Case Material
- Aluminium
- Case Size
- 40 mm
- Weight
- 19.96 g
- Water Resistance
- 0 m
- Dimensions
- 24 x 7.7 x 3 cm
Style
- Dial Shape
- Rectangle
- Collection
- Apple Watch SE
Description
The Apple Watch SE 3 GPS in 40mm is a smartwatch for people who want health, fitness and safety features in a simple package. It suits daily wear for anyone using an iPhone.
It offers temperature sensing for the Vitals and Cycle Tracking apps, a sleep score and sleep apnoea notifications. Workouts from running to strength training are tracked with real-time metrics and Workout Buddy. The GPS model connects through your iPhone or Wi-Fi.
Fall and severe car crash detection can help connect you with emergency services and notify your emergency contacts. Battery life is rated at 18 hours, and fast charging gives up to 8 hours in 15 minutes. Siri AI and customisable watch faces round out everyday use.
Frequently Asked Questions
Can I wear the SE 3 GPS for my daily workouts?
Yes for most sport, since the Apple Watch SE 3 tracks everything from running to strength training with real-time metrics and Workout Buddy. It also aims for 10K daily steps goals. Plan a charge after a full day because battery life is rated at 18 hours.
Will it work if I do not carry my iPhone?
The GPS model works with your iPhone or Wi-Fi to stay connected. With either one in range you can send texts, take calls, stream music and podcasts, use Siri and get notifications on the Apple Watch SE 3. Without both, connected features are limited.
How long does it take to charge, and will it last a full day?
Battery life is rated at 18 hours, which covers a typical day from sunrise to sunset. Charging is up to twice as fast as SE 2, and 15 minutes on the charger gives up to 8 hours, so a short top-up before bed is usually enough.
How does the SE 3 differ from the SE 2?
Compared with SE 2, the Apple Watch SE 3 adds temperature sensing, sleep score, sleep apnoea notifications and faster charging. If you only need basic notifications and workouts, an older model could be a cheaper alternative worth considering.
Does it need much service or maintenance?
Day to day, keep the sensors and band clean and install updates. As a smartwatch, the Apple Watch SE 3 has a battery that gradually wears with use, so a battery service through Apple may eventually be needed after several years.
Will the 40mm size suit my wrist?
The 40mm case suits small to medium wrists well and sits compactly under a sleeve. Bands come in a wide range of colours, styles and materials, so you can adjust the fit. If you prefer a larger display, consider a bigger case size.
Editor's take
Apple's SE line has long been the entry point into its smartwatch range, and the Watch SE 3 GPS in 40mm continues that role for iPhone owners who want core health and safety tools without stepping up in price. It is a GPS model, so it relies on a paired iPhone or Wi-Fi for connectivity.
The headline addition is temperature sensing, which feeds the Vitals and Cycle Tracking apps, alongside a sleep score and sleep apnoea notifications. For training, real-time metrics and Workout Buddy cover everything from running to strength sessions, and fall detection plus severe car crash detection add a safety layer.
The trade-off is endurance. The stated 18-hour battery life gets you from morning to night but not much further, so overnight sleep tracking means planning a charge window. Fast charging helps, with up to 8 hours in 15 minutes, though a mechanical or solar watch would never ask this of you.
It suits iPhone users wanting a capable everyday tracker. Anyone who wants multi-day battery or a traditional watch look should consider a hybrid smartwatch or a quartz sport watch instead.
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