Amazfit T-Rex Ultra 2 / Apple Watch Series 8 (45 mm, GPS)

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

Apple Watch Series 8 (45 mm, GPS): Apple Watch Series 8, 45 mm aluminium case, GPS model. The 41 mm case, GPS + Cellular and stainless steel versions are separate models; weight and screen size differ.

SpecificationAmazfit T-Rex Ultra 2Apple Watch Series 8 (45 mm, GPS)
Release year20262022
Announcement / availability19 February 2026 Amazfit—
Display1.5-inch AMOLED · 480 × 480 · sapphire glass AmazfitAlways-On Retina LTPO OLED; 396 × 484 pixels; 1143 sq mm display area; up to 1000 nits

The LTPO panel can lower its refresh rate a lot, so the screen stays on dimmed when the wrist is down.

Apple
Peak brightnessUp to 3000 nits

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

Amazfit		—
BodyPolymer case; Grade 5 titanium bezel, buttons and back Amazfit—
Size / weight51 × 51 × 14.3 mm; 89.2 g with strap

Thickness excludes heart-rate sensor base.

Amazfit		—
Strap26 mm silicone; 145–215 mm wrist Amazfit—
Storage64 GB total; up to 26.7 GB user space Amazfit32 GB Apple
PositioningDual-band GNSS; six satellite systems Amazfit—
SensorsBioTracker 6.0 PPG; barometer, compass, motion and temperature sensors Amazfit—
Battery870 mAh; up to 30 typical / 15 heavy / 10 AOD days

Separate manufacturer scenarios, not continuous GPS endurance.

Amazfit		—
GPS battery modesUp to 50 Accurate / 90 saving / 177 max-battery hours Amazfit—
WirelessBluetooth 5.2 BLE; 2.4 GHz Wi-Fi Amazfit—
Water / diving10 ATM; recreational diving up to 45 m

Not for technical, cave or mixed-gas diving.

Amazfit		—
Phone connectionAndroid 7+ / iOS 15+; Zepp app Amazfit—
ChargingMagnetic charging puck; USB-C cable separate Amazfit—
CallsBluetooth calls using microphone/speaker Amazfit—
Chip—S8 SiP with 64-bit dual-core processor; W3 wireless chip; U1 (Ultra Wideband)

Ultra Wideband is used for close-range location with an iPhone; availability varies by region.

Apple
Health sensors—Blood oxygen sensor; electrical heart sensor (ECG app); third-generation optical heart sensor

The Blood Oxygen app is not for medical use. The ECG app is not intended for people under 22 and may not be available in every country.

Apple
Motion and safety—High-g accelerometer up to 256 g (Fall Detection and Crash Detection); high dynamic range gyroscope; Emergency SOS; international emergency calling

On the GPS model, Emergency SOS needs a nearby iPhone or Wi-Fi Calling; international emergency calling works only on cellular models.

Apple
Location—L1 GPS, GLONASS, Galileo, QZSS and BeiDou; compass; always-on altimeter

This is single-frequency (L1) GPS; drift between tall buildings can be higher than on dual-frequency models.

Apple
Connectivity—Wi-Fi 802.11b/g/n 2.4 and 5 GHz; Bluetooth 5.3 Apple
Battery and charging—Up to 18 hours; built-in lithium-ion battery; USB-C magnetic fast charging cable

Apple’s 18-hour figure is based on 90 time checks, 90 notifications, 45 minutes of app use and a 60-minute workout with music; sleep tracking is not part of that scenario.

Apple
Durability—Water resistant to 50 metres under ISO 22810:2010; IP6X dust; ceramic and sapphire crystal back

Suitable for shallow-water activities in a pool or the sea; not for scuba diving, waterskiing or high-velocity water.

Apple
Size and weight—45 × 38 × 10.7 mm; aluminium GPS: 38.8 g Apple
Compatibility—Requires iPhone 8 or later with iOS 16 or later

It cannot be used with Android phones.

Apple
Colours—Aluminium: Midnight, Starlight, Silver, (PRODUCT)RED Apple