Dimensions
Size comparison
T-Rex 3Pro 4
| T-Rex 3 | Pro 4 | Difference | |
|---|---|---|---|
| Case size | 48.5 mm | 47 mm | +1.5 mm |
| Thickness | 13.8 mm | 9.9 mm | +3.8 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is T-Rex 3 better than Pro 4?
- Battery life (smartwatch mode)27 days vs 5 days5.4×
- Battery capacity700 mAh vs 440 mAh+59%
Why is Pro 4 better than T-Rex 3?
- Screen size1.5″ vs 1.56″+4%
- Thickness13.8 mm vs 9.9 mm+39%
Specifications
Side by side
| Design & durability | ||
| Case size | 48 mm | 47 mm |
| Weight | 68.3 g | — |
| Thickness | 13.8 mm | 9.9 mm |
| Height | 48.5 mm | — |
| Width | 48.5 mm | — |
| Case material | Stainless steel | Stainless steel |
| Lens / cover glass | Gorilla Glass | — |
| Water resistance | 10 ATM | — |
| Display | ||
| Screen size | 1.5″ | 1.56″ |
| Display technology | AMOLED | AMOLED |
| Panel | AMOLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Always-on display | — | Yes |
| Touchscreen | Yes | — |
| Resolution (width) | 480 px | 480 px |
| Resolution (height) | 480 px | 480 px |
| Pixel density | 322 ppi | — |
| Battery | ||
| Battery life (smartwatch mode) | 27 days | 5 days |
| Battery saver mode | 40 days | — |
| GPS battery life | 28 h | — |
| GPS battery life (dual-band) | 42 h | — |
| Battery capacity | 700 mAh | 440 mAh |
| Charging | Magnetic charging base | — |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | — | Yes |
| Skin temperature | — | Yes |
| Temperature sensor | Yes | — |
| HRV tracking | — | Yes |
| Sleep tracking | Yes | Yes |
| Sensors | — | heart rate, SpO2 |
| Sports & navigation | ||
| Built-in GPS | Yes | — |
| Dual-band GPS | Yes | — |
| Offline maps | Yes | — |
| Barometric altimeter | Yes | — |
| Compass | Yes | — |
| Sport profiles | 170 | — |
| Connectivity | ||
| Wi-Fi | Wi-Fi 4 | — |
| Bluetooth | 5.2 | 5.1 |
| Smart features | ||
| Calls from the wrist | Yes | — |
| Microphone | Yes | — |
| Voice assistant | Yes | — |
| Music on the watch | Yes | — |
| Platform | ||
| Platform | Proprietary | — |
| Works with | Android, iOS | iOS, Android |
| Chipset | — | Jieli AC7013A |
