vs
6.1Display5.8
4.9Health tracking4.9
Why is Tank S2 better than Siona 2 Nano?
- Battery life (smartwatch mode)10 days vs 6 days+67%
Why is Siona 2 Nano better than Tank S2?
Siona 2 Nano has no measurable advantages in this pair.
Specifications
Side by side
| Design & durability | ||
| Case size | — | 37 mm |
| Thickness | — | 6.9 mm |
| Lens / cover glass | Gorilla Glas | — |
| Strap material | Silikon | Edelstahl |
| Water resistance | 5 ATM | — |
| Water rating (maker) | 50 m / 5 bar / 5 ATM | — |
| Military-grade (MIL-STD-810) | Yes | — |
| Display | ||
| Screen size | 1.32″ | 1.3″ |
| Display technology | AMOLED | AMOLED |
| Panel | AMOLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Always-on display | Yes | Yes |
| Resolution (width) | 466 px | — |
| Resolution (height) | 466 px | — |
| Battery | ||
| Battery life (smartwatch mode) | 10 days | 6 days |
| Battery capacity | 390 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, accelerometer |
| Sports & navigation | ||
| Multisport / triathlon mode | — | Yes |
| Connectivity | ||
| Bluetooth | 5.3 | 5 |
| Platform | ||
| Works with | iOS, Android | iOS, Android |
