vs
5.8Display8.2
4.9Health tracking4.9
Dimensions
Size comparison
Siona 2 NanoStratos 4
| Siona 2 Nano | Stratos 4 | Difference | |
|---|---|---|---|
| Case size | 37 mm | 46.3 mm | −9.3 mm |
| Thickness | 6.9 mm | 14 mm | −7.1 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is Siona 2 Nano better than Stratos 4?
- Thickness6.9 mm vs 14 mm2×
Why is Stratos 4 better than Siona 2 Nano?
- Battery life (smartwatch mode)6 days vs 18 days3×
- Screen size1.3″ vs 1.43″+10%
Specifications
Side by side
| Design & durability | ||
| Case size | 37 mm | 49 mm |
| Weight | — | 60 g |
| Thickness | 6.9 mm | 14 mm |
| Height | — | 46.3 mm |
| Width | — | 46.3 mm |
| Case material | — | Plastic / polymer |
| Lens / cover glass | — | Gorilla Glas |
| Strap material | Edelstahl | Silikon |
| Water resistance | — | 5 ATM |
| Water rating (maker) | — | 50 m / 5 bar / 5 ATM |
| Colours | — | Black |
| Display | ||
| Screen size | 1.3″ | 1.43″ |
| Display technology | AMOLED | AMOLED |
| Panel | AMOLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Always-on display | Yes | — |
| Touchscreen | — | Yes |
| Resolution (width) | — | 466 px |
| Resolution (height) | — | 466 px |
| Battery | ||
| Battery life (smartwatch mode) | 6 days | 18 days |
| Battery capacity | — | 500 mAh |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | Yes | Yes |
| Sleep tracking | Yes | Yes |
| Sensors | heart rate, SpO2, accelerometer | heart rate, SpO2, accelerometer |
| Sports & navigation | ||
| Built-in GPS | — | Yes |
| Satellite systems | — | GPS, GLONASS, GALILEO, BDS |
| Multisport / triathlon mode | Yes | — |
| Connectivity | ||
| Bluetooth | 5 | 5.3 |
| Platform | ||
| Works with | iOS, Android | iOS, Android |
