Apple Watch Series 12 MJG24LS/A, 42mm
Apple Watch Series 12 is a 42mm GPS + Cellular smartwatch with HRV tracking, fall detection, Ceramic Shield 2 on aluminium cases and 24 hour battery life.
This page contains affiliate links. We may earn commission on qualifying purchases. Learn more
Price history
We just started tracking this watch. Price history is still building.
About this item
- Measures HRV as often as every five minutes and takes background heart rate readings every five seconds
- Vitals app, daily sleep score, cycle tracking and blood oxygen readings for a full health picture
- Readiness feature analyses recent activity, vitals and sleep to show your capacity for the day
- Pacer, Heart Rate Zones and Workout Buddy support running, hiking and strength training
- Fall and severe car crash detection can connect you with emergency services
- Up to 24 hours of normal use, with 15 minutes of fast charging giving up to 12 hours
Top Highlights
- Brand
- Apple Watch
- Model Name
- 12 GPS + Cellular
- Model Number
- MJG24LS/A
- Department
- Unisex
- Item Type
- Smart Watch
- Manufacturer
- Apple
- First Available
- 8 September 2026
Features & Specs
- Display
- Digital
- Case Size
- 42 mm
- Weight
- 269.3 g
- Water Resistance
- 0 m
- Dimensions
- 24 x 7.7 x 3 cm
Style
- Dial Shape
- Rectangle
- Collection
- Apple Watch Series 12
Description
Apple Watch Series 12 GPS + Cellular is a 42mm smartwatch built around health and fitness tracking. It suits anyone who wants heart, sleep and activity data on the wrist, plus calls and music without carrying a phone.
It measures HRV as often as every five minutes and takes background heart rate readings every five seconds. The Vitals app adds overnight metrics and a daily sleep score, while cycle tracking and blood oxygen readings round out the health tools. Aluminium cases use Ceramic Shield 2, and titanium and ceramic cases use a sapphire crystal display.
The cellular connection lets you make calls, stream music and podcasts and listen with AirPods even without your iPhone. Battery life reaches up to 24 hours of normal use, and a 15 minute fast charge gives up to 12 hours, which covers a full day with a short top-up.
Frequently Asked Questions
Can I use the Apple Watch Series 12 without my iPhone nearby?
With the GPS + Cellular version, the Series 12 can take and make calls, stream music and podcasts and play audio through AirPods even when your iPhone is not close. This suits runs or errands when you prefer to leave the phone at home. Cellular use depends on a compatible plan from your carrier.
How long will it last between charges for daily use?
Apple Watch Series 12 delivers up to 24 hours of normal use, so most people charge it once a day. Fast charging helps on busy days, since 15 minutes gives up to 12 hours of normal use. A quick top-up while you shower is often enough to keep it going.
Is it suitable for sport and strength training?
Yes for most sport. The Series 12 offers Pacer, Heart Rate Zones and Workout Buddy for running, hiking and strength training, and Workout Buddy needs a nearby iPhone. The 42mm size is compact enough for gym sessions without catching on sleeves or equipment.
What is the difference between aluminium and titanium cases?
Aluminium cases of the Series 12 use Ceramic Shield 2, which Apple describes as tougher than any smartwatch glass. Titanium and ceramic cases use a crack-resistant sapphire crystal display instead. Choose aluminium for lighter everyday wear and titanium or ceramic for a more premium build and scratch resistance.
Will the 42mm size fit my wrist?
A 42mm case is compact and generally suits smaller to medium wrists well, though many people with larger wrists also wear it for a neat, low-profile look. If you want a bigger display, consider a larger Apple Watch size. Trying both at a shop is the easiest way to decide.
Which health features does the Series 12 offer?
It measures HRV as often as every five minutes and takes background heart rate readings every five seconds. The Vitals app shows overnight metrics and a daily sleep score, and you can track your cycle and take blood oxygen readings. Fall and severe car crash detection add a safety layer.
Editor's take
Apple Watch Series 12 in 42mm is a health-first smartwatch for iPhone owners who want one device for fitness, sleep and safety data. It sits at the centre of Apple's wearable range, and the GPS + Cellular version is aimed at people who like leaving the phone behind.
The headline is the sensing. HRV is measured as often as every five minutes, with background heart rate readings every five seconds, and the Vitals app turns overnight data into a daily sleep score. For the case, aluminium models use Ceramic Shield 2, whilst titanium and ceramic versions get a sapphire crystal display.
There are trade-offs. Up to 24 hours of normal use means a nightly charging habit, which is the opposite of a mechanical or solar watch that runs for days or years. The fast charge of 15 minutes for up to 12 hours softens this, but it remains a daily routine. Several Siri AI and Audio Intelligence features are still rolling out or in beta.
It suits iPhone users who track training, sleep and recovery and value fall detection and cellular calling. If you want multi-day battery life, a GPS-focused sports watch is a sensible alternative; if you want something wound or serviced, look at a quartz or automatic watch instead.
In categories
Warranty & Support
User reviews
No reviews for this product yet. Sign in to write the first review; if you don't have an account, you can register from the sign-in screen.
