Apple Watch Series 12 / Apple Watch SE 3 (44 mm, GPS)

Apple Watch Series 12: 42 / 46 mm · Case material options

Apple Watch SE 3 (44 mm, GPS): 44 mm GPS · aluminium case (Midnight / Starlight)

SpecificationApple Watch Series 12Apple Watch SE 3 (44 mm, GPS)
Release year20262025
ProcessorS11; 64-bit dual-core; 4-core Neural Engine AppleApple S10 SiP; 64-bit dual-core processor, 4-core Neural Engine

The S10 enables the Always-On display, double tap and wrist flick gestures, on-device Siri and fast charging.

Apple
Storage64 GB Apple64 GB Apple
DisplayAlways-On Retina LTPO3 OLED; 326 ppi; 2000 nits peak, 1 nit minimum; 46 mm: 416 × 496; 42 mm: 374 × 446

LTPO3 drops to 1 Hz in Always-On mode to save power.

Apple		Always-On Retina, LTPO OLED; 368 × 448 pixels, 977 mm², 326 ppi

Because the LTPO panel can lower its refresh rate, the display keeps showing the time and notifications with the wrist down; this is the first SE with Always-On.

Apple
Cover glassAluminium: Ceramic Shield 2; titanium/ceramic: sapphire Apple—
Case and material42 / 46 mm; aluminium, titanium or ceramic

Ceramic cases are slightly larger and thicker (9.85 mm); aluminium and titanium are 9.7 mm.

Apple		—
Rated battery lifeUp to 24 hours normal use; up to 38 hours Low Power Mode; up to 10 hours workout tracking

Apple's test profile; actual use varies.

Apple		—
Rated charging timeAbout 80% in 30 minutes; 15 minutes gives up to 12 hours of normal use

Apple measured these with a 20 W adapter that is not included; a USB-C fast-charging cable is in the box.

Apple		—
SensorsSecond-generation electrical and always-on optical heart sensors; blood oxygen; temperature; compass; always-on altimeter; high-g accelerometer; depth gauge to 6 m; water temperature AppleSecond-generation optical heart sensor, temperature sensor, compass, always-on altimeter, high-g accelerometer, high dynamic range gyroscope, ambient light sensor

There is no ECG or blood oxygen sensor. The temperature sensor is not intended for medical use.

Apple
Health featuresECG; irregular rhythm and high/low heart rate notifications; hypertension and sleep apnoea notifications; sleep score; Vitals; Readiness

Some health features are limited by country and age; blood oxygen and temperature are not for medical use.

Apple		Heart rate and rhythm notifications, sleep apnoea notifications, sleep stages and sleep score, cycle tracking

Feature availability varies by country.

Apple
Weight46 mm aluminium GPS 39.5 g; titanium 44.9 g; 42 mm aluminium GPS 32.2 g; titanium 36.5 g Apple32.9 g (GPS) Apple
Durability50 m water resistance (ISO 22810:2010); IP6X dust

For swimming and snorkelling to 6 m, not scuba diving. Resistance can diminish over time.

Apple		—
ConnectivityWi-Fi 4 (2.4 and 5 GHz); Bluetooth 5.3; second-generation UWB; multi-constellation GPS; RedCap 5G on cellular models Apple—
CompatibilitywatchOS 27; iPhone 11 or later (including iPhone SE 2nd generation or later) running iOS 27 AppleiPhone 11 or later, iPhone SE (2nd generation) or later Apple
Announcement—September 9, 2025; on sale from September 19, 2025 Apple
Case—44 mm aluminium; 44 × 38 × 10.7 mm

A 40 mm version also exists with different size, display and battery values.

Apple
Brightness—1,000 nits peak; 2 nits minimum Apple
Front glass—Ion-X glass

Apple claims 4x better crack resistance than the SE 2.

Apple
Gestures—Double tap; wrist flick (watchOS 26)

Wrist flick dismisses notifications and calls, silences alarms and returns to the watch face with one hand.

Apple
Speaker—Yes; can play music and podcasts Apple
Water resistance—50 metres (ISO 22810:2010); swimproof Apple
Wireless—Wi-Fi 4 (802.11n, 2.4 GHz only); Bluetooth 5.3 Apple
Location—L1 GPS, GLONASS, Galileo, QZSS, BeiDou

This is single-frequency (L1) GPS; position can drift under trees and between tall buildings.

Apple
Battery life—Up to 18 hours of normal use; up to 32 hours in Low Power Mode

In Apple's test the watch stays connected to an iPhone over Bluetooth throughout; results vary with use and settings.

Apple
Charging—Fast charging: about 80% in 45 minutes; 15 minutes gives up to 8 hours of use

Times are with the included Apple Watch Magnetic Fast Charger to USB-C Cable; no adapter is included.

Apple
Colour options—Midnight or Starlight aluminium case Apple