📱 Model features |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Model | Watch 2 (38mm) | Amazfit T-Rex Pro |
| Other model names | Apple Watch Series 2 Stainless Steel A1757 38mm, iWatch S2 | Mi Amazfit TRex Pro |
| Country or region available | 
(Global, International) |
(Global, International) |
| Brand | Apple | Xiaomi |
| Release date | 12/1/2016 | 3/23/2021, Announced: 3/5/2021 |
| Depth | 11.4 millimeters (0.45 inches) | 13.5 millimeters (0.53 inches) |
| Size (width x height) | 33.3 x 38.6 millimeters (1.31 x 1.52 in) | 47.47 x 47.47 millimeters (1.87 x 1.87 in) |
| Weight | 42 grams (1.47 ounces) | 59 grams (2.07 ounces) |
| Build, materials | Stainless steel body, glass front, ceramic back | Plastic body, glass front |
| Protection against water and others | 5 ATM: 50 meters waterproof | 10 ATM: 100 meters waterproof |
🤖 Operating System |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| System version | WatchOS 3.0 | Proprietary OS |
| Firmware update | WatchOS 5.0 | feature not registered |
| User Interface | feature not registered | RTOS |
⚙️ Processor |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Chipset | 32bit: Apple S2 (28nm) | 32bit |
| CPU | Dual-core, 1 processor:
2x 780MHz ARM Cortex-A7 (Dual-core) | Single-core, 1 processor:
Single-core |
| GPU graphical controller | PowerVR G6200 | feature not registered |
| Performance (benchmark) | feature not registered | feature not registered |
💽 Memory and storage |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| RAM memory | 512MB LPDDR3 | 512MB LPDDR3 |
| Internal storage | 8GB (5GB available) | 4GB (2GB available)
eMCP |
| External storage | Not supported | Not supported |
📲 Display |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Display type | AMOLED | AMOLED |
| Screen size | 1.5" inches | 1.3" inches |
| Screen-to-body ratio | ~55.1% (screen-to-body ratio) | ~24.2% (screen-to-body ratio) |
| Display resolution | 340x272 pixels | 360x360 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 290 PPI | 392 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Sapphire Glass | Gorilla Glass 3 |
| Refresh rate | feature not registered | 60Hz |
| Display features | feature not registered | Not supported |
📶 Mobile networks |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Dual-SIM | Not supported | Not supported |
| SIM card | Not supported | Not supported |
| Maximum Download / Upload | feature not registered | feature not registered |
| Network technology | feature not registered | feature not registered |
| Frequency, bands | Expand band detailsCollapse details |
| GSM MHz band | Not supported | Not supported |
| Primary 2G network | Not supported | Not supported |
| Primary 3G network | Not supported | Not supported |
| Primary 4G network | Not supported | Not supported |
| Primary 5G network | Not supported | Not supported |
| Primary data network | Not supported | Not supported |
| Secondary 2G network | Not supported | Not supported |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | Not supported | Not supported |
📷 Camera |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Back camera (main camera) | Not supported | Not supported |
| Main camera resolution | Not supported | Not supported |
| Video recording (primary) | Not supported | Not supported |
| Flash | Not supported | Not supported |
| Focal aperture | feature not registered | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
| Autofocus | Not supported | Not supported |
| Touch focus | Not supported | Not supported |
| Image stabilization | Not supported | Not supported |
| Zoom | Not supported | Not supported |
| Face/smile detection | Not supported | Not supported |
| BSI sensor | Not supported | Not supported |
| HDR | Not supported | Not supported |
| Camera extras | feature not registered | feature not registered |
📸 Front camera |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Front camera (secondary) | Not supported | Not supported |
| Front camera resolution | Not supported | Not supported |
| Video recording (secondary) | Not supported | Not supported |
| Front flash | Not supported | Not supported |
| Focal aperture | feature not registered | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
🔉 Sound and multimedia |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Loudspeaker | Supported | feature not registered |
| Active noise cancellation | Not supported | Not supported |
| Radio | Not supported | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4, H.264, H.263 | feature not registered |
| Audio formats | MP3, WAV, eAAC+, FLAC | feature not registered |
🔌 Connectivity |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| USB | Not supported | Not supported |
| Audio output | Not supported | Not supported |
| TV output | Not supported | Not supported |
| Bluetooth | 4.0 + A2DP | 5.0 + A2DP/LE |
| WiFi | 802.11 b/g/n (2.4GHz) | Not supported |
| DLNA | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS, BeiDou |
| NFC | Supported | Not supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Sensors | Accelerometer
Ambient Light sensor
Gyroscope
Heart rate
Pedometer | Accelerometer
Ambient Light sensor
Barometer
Compass
Heart rate
Pedometer
SpO2 |
| Vibrating alert | Supported | Supported |
🔋 Battery |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Battery type | Li-Ion: Lithium-Ion (Non removable) | LiPo: Li-Ion polymer (Non removable) |
| Battery capacity | 273 mAh | 390 mAh |
| Charger, watts | Wired charging | Wired charging |
| Wireless charging | Magnetic charging (dock) | Magnetic charging (dock) |
| Talk time autonomy | 18 hours | 432 hours (18 days) |
| Standby | feature not registered | 432 hours (18 days) |
➕ Other features |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| Call control | Not supported | Not supported |
| Messaging | SMS, E-mail | SMS (T9), E-mail |
| Hands-free calling | Supported | Not supported |
| Video calling | Not supported | Not supported |
| Ringtones | feature not registered | feature not registered |
| Web browser | Not supported | Not supported |
| Antenna | Not supported | feature not registered |
| Qwerty physical keyboard | Not supported | Not supported |
| Miscellaneous | • Colors: Space black, Silver
• Sport or leather bands
• 1000 nits screen
• 3D Touch display
• Siri
• Requires an iPhone 5s/iOS 11 or later | • Colors: Black, Gray, Blue
• Watch band: 22mm
• BioTracker PPG
• 100 sports mode
• AppZepp app
• Compatible with Android 5.0/iOS 10 and above |
☢️ Radiation rate |
| Apple Watch 2 (38mm) | Xiaomi Amazfit T-Rex Pro |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |