Apple Watch Series 11 (46 mm, GPS) / Amazfit T-Rex 3 (48 mm)

Because LTPO can drop the refresh rate very low, the display stays dimly on even with the wrist down. Wide-angle OLED is used to reduce brightness loss when the screen is viewed from the side.

There is also a night display mode.

According to Apple, the coating gives twice the scratch resistance of the Series 10 Ion-X glass. Titanium cases use sapphire crystal.

The electrical sensor records a single-lead ECG with the ECG app. According to Apple, blood oxygen and wrist temperature are for general wellness, not medical use.

Hypertension notifications do not measure blood pressure; they alert when patterns in the optical sensor data suggest high blood pressure. According to Apple, they are not for users under 22, those already diagnosed with hypertension or pregnant users.

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

This GPS model has no cellular connection; calls and data come through the paired iPhone or Wi-Fi. Ultra Wideband availability varies by country.

Times are based on Apple’s usage scenario; workouts, GPS and the Always-On display shorten them.

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.

The box includes a Magnetic Fast Charger to USB-C cable; Apple’s fast-charge figures used a separately sold 20 W USB-C adapter.

The 42 mm aluminium GPS version weighs 30.3 g.

The watch cannot be used with Android phones.

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

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.

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.

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

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.

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.