Amazfit T-Rex 3 (48 mm) / Samsung Galaxy Watch5 Pro (45 mm)

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.

Samsung Galaxy Watch5 Pro (45 mm): The Galaxy Watch5 Pro comes in one size (45 mm): SM-R920 (Bluetooth) and SM-R925 (LTE), in Black Titanium and Gray Titanium. The 40/44 mm Galaxy Watch5 is a separate model with a different battery, case material and display size.

Specification	Amazfit T-Rex 3 (48 mm)	Samsung Galaxy Watch5 Pro (45 mm)
Release year	2024	2022
Display	1.5-inch AMOLED, 480 × 480 pixels, 322 ppi; Gorilla Glass touchscreen There is also a night display mode. Amazfit	1.4-inch (34.6 mm) 450 × 450 Super AMOLED; full-colour Always On Display The bezel is raised above the display, which Samsung designs to protect the glass from knocks. There is no rotating bezel; menus are navigated with touch gestures and the buttons. Samsung
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	—
Weight	68.3 g (without strap) 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	—
Battery	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	—
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	—
Sensors	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	Samsung BioActive Sensor (Optical Heart Rate + Electrical Heart Signal + Bioelectrical Impedance Analysis), temperature, accelerometer, barometer, gyro, geomagnetic, light sensor Electrical Heart Signal enables ECG and Bioelectrical Impedance enables body composition estimates; ECG works through the Samsung Health Monitor app only in approved markets. Samsung
Connectivity	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	Bluetooth 5.2, Wi‑Fi 802.11 a/b/g/n 2.4 + 5 GHz, NFC, GPS/Glonass/Beidou/Galileo; LTE (LTE model only) The LTE model can make calls and use data without the phone nearby; support depends on the carrier. Samsung
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	—
Compatibility	Android 7.0 and later, iOS 14.0 and later; Zepp app Amazfit	—
Glass and case	—	Sapphire Crystal; titanium case with D-Buckle Sport Band The D-buckle band folds open; because the watch cannot lie flat, it is charged on its side on the Samsung charger. Samsung
Processor	—	Exynos W920, dual-core 1.18 GHz Samsung
Memory and storage	—	1.5 GB RAM + 16 GB internal storage Samsung
Battery and charging	—	590 mAh (typical); WPC-based wireless faster charging Samsung says real battery life varies with network environment and usage patterns. 590 mAh is about 44% larger than the 410 mAh battery in the 44 mm Galaxy Watch5. Samsung
Operating system	—	Wear OS 3.5 (Powered by Samsung) with One UI Watch 4.5 at launch Activation requires connecting to an Android phone with Google Mobile Services; it cannot be used with an iPhone. Samsung
Durability	—	5ATM + IP68 / MIL-STD-810H 5ATM covers surface water use such as swimming, not diving or high-pressure water. MIL-STD-810H is the US military standard for environmental test methods. Samsung
Phone compatibility	—	Android 8.0 or higher with more than 1.5 GB of RAM Samsung
Size and weight	—	45.4 × 45.4 × 10.5 mm; 46.5 g Dimensions are measured without the health sensors and weight without the strap. Samsung