vs
9.7Display9.1
4.9Health tracking4.9
Why is Tank M4 better than FW66 Iron R?
- Screen size1.96″ vs 1.43″+37%
Why is FW66 Iron R better than Tank M4?
- Battery life (smartwatch mode)10 days vs 14 days+40%
- Weight60 g vs 56 g+7%
- Resolution (width)410 px vs 466 px+14%
Specifications
Side by side
| Design & durability | ||
| Case size | — | 45 mm |
| Weight | 60 g | 56 g |
| Thickness | — | 11 mm |
| Height | — | 51 mm |
| Width | — | 45 mm |
| Lens / cover glass | Gorilla Glas | 2.5D-Glas Kristallglas |
| Strap material | — | Edelstahl, Silikon |
| Water resistance | 10 ATM | — |
| Water rating (maker) | 100 m / 10 bar / 10 ATM | — |
| Colours | — | Black |
| Display | ||
| Screen size | 1.96″ | 1.43″ |
| Display technology | AMOLED | AMOLED |
| Panel | AMOLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Resolution (width) | 410 px | 466 px |
| Resolution (height) | 502 px | 466 px |
| Battery | ||
| Battery life (smartwatch mode) | 10 days | 14 days |
| Battery capacity | — | 300 mAh |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | Yes | — |
| Sleep tracking | Yes | Yes |
| Sensors | heart rate, SpO2 | heart rate, SpO2 |
| Sports & navigation | ||
| Built-in GPS | Yes | — |
| Satellite systems | GPS | — |
| Connectivity | ||
| LTE (cellular) | — | No |
| Bluetooth | 5.3 | — |
| Smart features | ||
| Music on the watch | — | Yes |
| Storage | — | 128 GB |
| Platform | ||
| Works with | iOS, Android | — |
| Chipset | — | RTL8763E |
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