Google Pixel Watch 4 (41 mm, Wi-Fi) / Amazfit T-Rex 3 (48 mm)

Google Pixel Watch 4 (41 mm, Wi-Fi): 41 mm Wi-Fi (GA10840-US) · Polished Silver aluminium case

Amazfit T-Rex 3 (48 mm): 48.5 mm case, 1.5-inch AMOLED; Onyx (black), Lava and Gray colours. The T-Rex 3 Pro, T-Rex 2 and the T-Rex Ultra 2 are separate models.

SpecificationGoogle Pixel Watch 4 (41 mm, Wi-Fi)Amazfit T-Rex 3 (48 mm)
Release year20252024
Case41 mm, 100% recycled aluminium; 12.3 mm height Google—
Weight31.0 g (without band)

The 45 mm model weighs 36.7 g.

Google		68.3 g (without strap) Amazfit
DisplayCurved Actua 360 AMOLED LTPO; 320 ppi; DCI-P3; always-on display

GIGAZINE gives the 41 mm model's resolution as 426 × 426.

Google		1.5-inch AMOLED, 480 × 480 pixels, 322 ppi; Gorilla Glass touchscreen

There is also a night display mode.

Amazfit
Brightness and refreshUp to 3000 nits peak; 1 nit minimum in always-on mode; 1–60 Hz

The ability to drop to 1 Hz reduces the battery cost of the always-on display.

Google		—
Display glassCustom 3D Corning Gorilla Glass 5 Google—
ProcessorQualcomm Snapdragon W5 Gen 2; Cortex-M55 co-processor

The co-processor handles notifications and sensor work while the screen is off without waking the main processor, saving battery.

Google		—
Memory and storage2 GB SDRAM; 32 GB eMMC Google—
Battery325 mAh typical; up to 30 hours with always-on display, up to 48 hours with Battery Saver

The 45 mm model has a 455 mAh battery and up to 40 hours with the always-on display.

Google		700 mAh; 27 days typical, 13 days heavy use, 40 days battery saver, 81 days clock mode; 42 hours in accuracy GPS mode, 72 hours power-saving GPS, 180 hours maximum GPS mode

A full charge takes about 3 hours; a magnetic charging base is in the box but no USB-C cable. Low-temperature mode gives 28 hours with GPS on and 32 days with it off. The maximum GPS mode works only in hiking and climbing modes.

Amazfit
ChargingQuick Charge Dock: about 50% in 15 minutes, 80% in 25 minutes, 100% in 45 minutes

The watch sits in a new side-mounted dock; earlier Pixel Watch chargers do not fit this model.

Google		—
SensorsOptical heart rate, SpO2 (red/infrared), ECG-capable electrical sensors, skin conductance (cEDA), skin temperature, compass, altimeter, barometer, accelerometer, gyroscope, ambient light

ECG and some health features may be limited by country; readings are not a medical diagnosis.

Google		BioTracker 6.0 PPG biometric sensor; accelerometer, gyroscope, magnetometer, barometric altimeter, ambient light, temperature sensor

The watch offers an altitude assistant, storm alerts, compass, sunrise/sunset and tide information, and prompts for blood-oxygen readings at high altitude.

Amazfit
LocationDual-frequency GPS (GPS, Galileo, GLONASS) Google—
ConnectivityBluetooth 6.0; Wi-Fi 802.11 a/b/g/n/ac/ax (2.4 and 5 GHz); NFC; UWB

This entry covers the Wi-Fi model; LTE and UMTS cellular connectivity is only on the LTE model.

Google		Bluetooth 5.2 (BLE), 2.4 GHz Wi-Fi; microphone; music storage

Wi-Fi is used to download software updates without the phone. The watch shows incoming calls but cannot take Bluetooth calls; quick reply works on Android only.

Amazfit
Durability5 ATM; IP68

5 ATM suits shallow-water activities like swimming, not diving or high-speed water sports.

Google		—
ControlsSide button, haptic crown; Gen 3 Premium haptics Google—
AudioBuilt-in microphone and speaker Google—
Operating systemWear OS 6.0 Google—
CompatibilityAndroid 11.0 or newer; Google Account and Pixel Watch app

Some features depend on the phone's Android version and the Pixel Watch app.

Google		Android 7.0 and later, iOS 14.0 and later; Zepp app Amazfit
Band fitSmall 130–175 mm, Large 165–210 mm wrist Google—
Case and strap—48.5 × 48.5 × 13.75 mm; stainless-steel bezel, polymer middle frame; 4 buttons; 22 mm liquid-silicone strap for 145–210 mm wrists

The 22 mm strap is a standard width and can be swapped.

Amazfit
Water and diving—10 ATM; freediving to 45 metres (147 ft) certified to EN 13319, ISO 6425 and GB/T 18828

10 ATM means withstanding the pressure of 100 metres of still water for up to 10 minutes. Breath-hold training and testing are downloaded through the Zepp app.

Amazfit
Positioning and navigation—Dual-band and single-band modes; 6 satellite systems; offline maps, turn-by-turn directions, route import, back-to-start and off-route alerts

Dual-band positioning receives two frequencies from the satellites to reduce drift from reflected signals among tall buildings and dense trees; it uses more battery. Automatic mode switches settings based on signal strength.

Amazfit
Sports and health—170+ sports modes (177 listed); recognition of 25 strength and 8 sports movements; 24-hour heart rate, blood oxygen and stress; sleep stages; PAI; Zepp Coach

Chest straps, running/cycling power meters and cycling speed/cadence sensors can be paired; data can be exported to apps such as Strava, komoot and Apple Health.

Amazfit