vs
5.8Display8.2
4.9Health tracking4.9
Dimensions
Size comparison
Siona 2Stratos 3 Pro
| Siona 2 | Stratos 3 Pro | Difference | |
|---|---|---|---|
| Case size | 42 mm | 46.3 mm | −4.3 mm |
| Thickness | 6.9 mm | 14.8 mm | −7.9 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is Siona 2 better than Stratos 3 Pro?
- Thickness6.9 mm vs 14.8 mm2.1×
Why is Stratos 3 Pro better than Siona 2?
- Battery life (smartwatch mode)2 days vs 20 days10×
- Battery capacity150 mAh vs 400 mAh2.7×
- Screen size1.3″ vs 1.43″+10%
Specifications
Side by side
| Design & durability | ||
| Case size | 42 mm | 46 mm |
| Weight | — | 60 g |
| Thickness | 6.9 mm | 14.8 mm |
| Height | — | 46.3 mm |
| Width | — | 46.3 mm |
| Case material | — | Plastic / polymer |
| Lens / cover glass | — | Chemisch verstärktes Glas |
| Strap material | — | Silikon |
| 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) | 2 days | 20 days |
| Battery capacity | 150 mAh | 400 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 |
