Apple Watch Series 12 / Amazfit T-Rex Ultra 2

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

Amazfit T-Rex Ultra 2: A2550 · 51 mm · Black Magma · silicone strap

SpecificationApple Watch Series 12Amazfit T-Rex Ultra 2
Release year20262026
ProcessorS11; 64-bit dual-core; 4-core Neural Engine Apple—
Storage64 GB Apple64 GB total; up to 26.7 GB user space Amazfit
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		1.5-inch AMOLED · 480 × 480 · sapphire glass Amazfit
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 AppleBioTracker 6.0 PPG; barometer, compass, motion and temperature sensors Amazfit
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		—
Weight46 mm aluminium GPS 39.5 g; titanium 44.9 g; 42 mm aluminium GPS 32.2 g; titanium 36.5 g 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 Apple—
Announcement / availability—19 February 2026 Amazfit
Peak brightness—Up to 3000 nits

With auto brightness; unavailable in low-temperature mode or below 30% battery.

Amazfit
Body—Polymer case; Grade 5 titanium bezel, buttons and back Amazfit
Size / weight—51 × 51 × 14.3 mm; 89.2 g with strap

Thickness excludes heart-rate sensor base.

Amazfit
Strap—26 mm silicone; 145–215 mm wrist Amazfit
Positioning—Dual-band GNSS; six satellite systems Amazfit
Battery—870 mAh; up to 30 typical / 15 heavy / 10 AOD days

Separate manufacturer scenarios, not continuous GPS endurance.

Amazfit
GPS battery modes—Up to 50 Accurate / 90 saving / 177 max-battery hours Amazfit
Wireless—Bluetooth 5.2 BLE; 2.4 GHz Wi-Fi Amazfit
Water / diving—10 ATM; recreational diving up to 45 m

Not for technical, cave or mixed-gas diving.

Amazfit
Phone connection—Android 7+ / iOS 15+; Zepp app Amazfit
Charging—Magnetic charging puck; USB-C cable separate Amazfit
Calls—Bluetooth calls using microphone/speaker Amazfit