📱 Model features |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| Model | Amazfit T-Rex | Gear S (3G SM-R750A) |
| Other model names | Mi Amazfit TRex | AT&T Samsung Gear S SM-R750A, Samsung SM-R750A |
| Country or region available | 
(Global, International) | 
USA |
| Brand | Xiaomi | Samsung |
| Release date | 1/9/2020, Announced: 1/1/2020 | 11/1/2014 |
| Depth | 13.5 millimeters (0.53 inches) | 12.5 millimeters (0.49 inches) |
| Size (width x height) | 47.47 x 47.47 millimeters (1.87 x 1.87 in) | 39.9 x 58.1 millimeters (1.57 x 2.29 in) |
| Weight | 58 grams (2.03 ounces) | 67 grams (2.35 ounces) |
| Build, materials | Plastic body, glass front | feature not registered |
| Protection against water and others | 5 ATM: 50 meters waterproof | Waterproof (IP?) |
🤖 Operating System |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| System version | Proprietary OS | Tizen 2.3 |
| Firmware update | feature not registered | feature not registered |
| User Interface | RTOS | feature not registered |
⚙️ Processor |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| Chipset | 32bit | 32bit: Samsung Exynos 4212 |
| CPU | Single-core, 1 processor:
Single-core | Dual-core, 1 processor:
2x 1GHz ARM Cortex-A9 (Dual-core) |
| GPU graphical controller | feature not registered | ARM Mali-400 MP4 400Mhz |
| Performance (benchmark) | feature not registered | feature not registered |
💽 Memory and storage |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| RAM memory | 512MB LPDDR3 | 512MB |
| Internal storage | 4GB (2GB available)
eMCP | 4GB (2GB available) |
| External storage | Not supported | Not supported |
📲 Display |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| Display type | AMOLED | Super AMOLED |
| Screen size | 1.3" inches | 2" inches |
| Screen-to-body ratio | ~24.2% (screen-to-body ratio) | ~53.4% (screen-to-body ratio) |
| Display resolution | 360x360 pixels | 360x480 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 392 PPI | 300 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass 3 | Gorilla Glass 3 |
| Refresh rate | 60Hz | feature not registered |
| Display features | Not supported | feature not registered |
📶 Mobile networks |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| Dual-SIM | Not supported | Not supported |
| SIM card | Not supported | 1 slot (Single-SIM)
nano-SIM (4FF) |
| Maximum Download / Upload | feature not registered | 21/5.76 Mbps |
| Network technology | feature not registered | 2G, 3G |
| Frequency, bands | Expand band detailsCollapse details |
| GSM MHz band | Not supported | Dual-Band 850/1900 |
| Primary 2G network | Not supported | GSM 850/1900 |
| Primary 3G network | Not supported | UMTS 850/1900 |
| Primary 4G network | Not supported | Not supported |
| Primary 5G network | Not supported | Not supported |
| Primary data network | Not supported | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+ |
| 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 |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| 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 | feature not registered |
| 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 |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| 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 |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| Loudspeaker | feature not registered | Supported |
| Active noise cancellation | Not supported | Not supported |
| Radio | Not supported | Not supported |
| TV | Not supported | Not supported |
| Video formats | feature not registered | feature not registered |
| Audio formats | feature not registered | MP3, WAV, WMA, eAAC+ |
🔌 Connectivity |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| USB | Not supported | MicroUSB 2.0 |
| Audio output | Not supported | Not supported |
| TV output | Not supported | Not supported |
| Bluetooth | 5.0 + A2DP/LE | 4.1 + A2DP |
| WiFi | Not supported | 802.11 b/g/n (2.4Ghz) |
| DLNA | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS |
| NFC | Not supported | Not supported |
| Infrared port | Not supported | Supported |
🧭 Sensors |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| Sensors | Accelerometer
Ambient Light sensor
Compass
Heart rate
Pedometer
SpO2 | Accelerometer
Ambient Light sensor
Barometer
Compass
Gyroscope
Heart rate
Proximity sensor
UV radiation |
| Vibrating alert | Supported | Supported |
🔋 Battery |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| Battery type | LiPo: Li-Ion polymer (Non removable) | Li-Ion: Lithium-Ion (Non removable) |
| Battery capacity | 390 mAh | 300 mAh |
| Charger, watts | Wired charging
Magnetic charging (dock) | Wired charging |
| Talk time autonomy | 20 hours | 5 hours |
| Standby | 480 hours (20 days) | 96 hours (4 days) |
➕ Other features |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| Call control | Not supported | Voice dialing, Voice recorder, Voice commands |
| Messaging | SMS (T9), E-mail | SMS (T9), E-mail |
| Hands-free calling | Not supported | Supported |
| Video calling | Not supported | Not supported |
| Ringtones | feature not registered | Polyphonic and customized |
| Web browser | Not supported | Not supported |
| Antenna | feature not registered | Internal antenna |
| Qwerty physical keyboard | Not supported | Not supported |
| Miscellaneous | - Colors: Black, Gray, Camouflage, Army green, Khaki
- Watch band: 22mm
- BioTracker PPG
- 14 sports mode
- AppZepp app
- Compatible with Android 5.0/iOS 10 and above | - Colors: Black, White
- S-Voice
- S-Health
- IP67 certified: dust and water resistant up to 1 meter and 30min |
☢️ Radiation rate |
| Xiaomi Amazfit T-Rex | Samsung Gear S (3G SM-R750A) |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | 0.92W/kg (head), 0.91W/kg (body) |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |