Is the Series 12 worth it over an older Apple Watch?

If you want the most accurate heart-rate tracking, short-interval HRV and the Readiness score, the Series 12 is the stronger health tool. Owners of a recent model with good battery life may not find enough new to justify switching.

Does it work with Android phones?

No. The Apple Watch Series 12 pairs with an iPhone, and setup and most features require one.

How often do I need to charge it?

Expect to charge it about once a day, more often if you use GPS workouts and always-on display heavily. Sleep tracking means finding a charging window during the day.

Can it measure blood oxygen?

Yes, it measures blood oxygen saturation, but the reading is a wellness metric, not a medical diagnosis.

The watch with the 42mm gold aluminium case and Arena Sport Band, plus a charging cable. A power adapter is not included.

Is the 42mm case a good size?

The 42mm case suits most wrists and is the smaller option, lighter for sleep tracking. Those who prefer a larger screen should look at the bigger case size.

Apple Watch Series 12 (Dorado, Aluminium, 42 Mm, Correa Deportiva Arena S/M) Mjed4zr/A

Q: Where is the Apple Watch Series 12 (Dorado, Aluminium, 42 Mm, Correa Deportiva Arena S/M) Mjed4zr/A cheapest?

At Amazon, for $389.99, as of our latest check.

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$389.99at AmazonChecked Nov 12

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What reviewers say

Owners of recent Apple Watch models praise the heart-rate accuracy and the sleep and recovery data, and call the readiness score genuinely useful for training. Common complaints are battery life and the iPhone-only setup.

What people mention

Heart ratePraisedOwners say the heart-rate and HRV readings are accurate enough to trust during workouts and recovery.
BatteryCriticisedReviewers complain the watch needs charging almost every day, especially with sleep tracking on.
ReadinessPraisedThe daily Readiness score is called a useful guide for deciding whether to rest or train hard.
Sleep trackingPraisedOvernight vitals and sleep data are described as clear and easy to act on.
IPhone onlyCriticisedBuyers note the watch is effectively limited to iPhone users, which rules out Android owners.

About the Apple Watch Series 12 (Dorado, Aluminium, 42 Mm, Correa Deportiva Arena S/M) Mjed4zr/A

The Apple Watch Series 12 is a GPS smartwatch with a 42 mm gold aluminum case and a Sand Sport Band in size S/M. It has an OLED touchscreen display with 374 x 446 pixels and is powered by the S11 chip. The aluminum case has a Ceramic Shield 2 front.

It tracks heart rate in the background every five seconds and heart rate variability every five minutes. This gives data on stress, recovery and sleep quality. The Vitals app shows overnight health data, and the watch can measure blood oxygen. A Readiness score is calculated each morning from recent activity, vital signs and sleep, then adjusted through the day. For workouts, it offers Pace Target, Heart Rate Zones, advanced metrics and Workout Buddy, which uses Apple Intelligence on a paired iPhone.

Fall detection and crash detection can call emergency services, share your location and alert chosen contacts. The watch also has Emergency SOS, ECG and Cycle Tracking apps. It works with an iPhone or a Wi-Fi network for messages, calls, music, Siri and notifications.

Model

Apple Watch Series 12, MJED4ZR/A

Case

42 mm aluminum, gold (Dorado)

Band

Sport Band, Sand (Arena), S/M

Display

OLED touchscreen, 374 x 446 pixels

Screen protection

Ceramic Shield 2

Chip

S11