Why is T-Rex 2 better than Tank M4?
- Battery life (smartwatch mode)24 days vs 10 days2.4×
- Resolution (width)454 px vs 410 px+11%
Why is Tank M4 better than T-Rex 2?
- Screen size1.39″ vs 1.96″+41%
- Weight66.5 g vs 60 g+11%
Specifications
Side by side
| Design & durability | ||
| Case size | 47 mm | — |
| Weight | 66.5 g | 60 g |
| Thickness | 13.6 mm | — |
| Height | 47.1 mm | — |
| Width | 47.1 mm | — |
| Case material | Plastic / polymer | — |
| Lens / cover glass | Glass material | Gorilla Glas |
| Water resistance | 10 ATM | 10 ATM |
| Water rating (maker) | — | 100 m / 10 bar / 10 ATM |
| Display | ||
| Screen size | 1.39″ | 1.96″ |
| Display technology | AMOLED | AMOLED |
| Panel | AMOLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Touchscreen | Yes | — |
| Resolution (width) | 454 px | 410 px |
| Resolution (height) | 454 px | 502 px |
| Pixel density | 326 ppi | — |
| Battery | ||
| Battery life (smartwatch mode) | 24 days | 10 days |
| GPS battery life | 50 h | — |
| GPS battery life (dual-band) | 26 h | — |
| Battery capacity | 500 mAh | — |
| Charging | Magnetic 2-pin pogo pin | — |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | — | Yes |
| Sleep tracking | Yes | Yes |
| Sensors | — | heart rate, SpO2 |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Dual-band GPS | Yes | — |
| Satellite systems | — | GPS |
| Barometric altimeter | Yes | — |
| Compass | Yes | — |
| Sport profiles | 158 | — |
| Connectivity | ||
| Bluetooth | 5 | 5.3 |
| Platform | ||
| Platform | Proprietary | — |
| Works with | — | iOS, Android |
