Dimensions
Size comparison
Watch S2Watch S4
| Watch S2 | Watch S4 | Difference | |
|---|---|---|---|
| Height | 46 mm | 47.3 mm | −1.3 mm |
| Width | 46 mm | 47.3 mm | −1.3 mm |
| Thickness | 10.7 mm | 12 mm | −1.3 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is Watch S2 better than Watch S4?
- Thickness10.7 mm vs 12 mm+12%
- Battery capacity500 mAh vs 486 mAh+3%
Why is Watch S4 better than Watch S2?
- LTE (cellular)No · Watch S2: Yes
- eSIMNo · Watch S2: Yes
Specifications
Side by side
| Design & durability | ||
| Case size | 46 mm | 47 mm |
| Weight | — | 44.5 g |
| Thickness | 10.7 mm | 12 mm |
| Height | 46 mm | 47.3 mm |
| Width | 46 mm | 47.3 mm |
| Case material | Stainless steel | Aluminium |
| Sapphire crystal | Yes | — |
| Lens / cover glass | — | Scratch/drop-proof glass |
| Water resistance | 5 ATM | 5 ATM |
| Water rating (maker) | — | 50 m / 5 bar / 5 ATM |
| Colours | Black, Silver, Light Gold | Black, Silver, Rainbow |
| Display | ||
| Screen size | 1.43″ | 1.43″ |
| Display technology | AMOLED | AMOLED |
| Panel | AMOLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Touchscreen | — | Yes |
| Resolution (width) | 466 px | 466 px |
| Resolution (height) | 466 px | 466 px |
| Pixel density | 326 ppi | 326 ppi |
| Peak brightness | — | 2,200 nits |
| Refresh rate | 60 Hz | 60 Hz |
| Battery | ||
| Battery life (smartwatch mode) | — | 15 days |
| Battery capacity | 500 mAh | 486 mAh |
| Battery type | Li-Po | Li-Po |
| Wireless charging | Yes | — |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | — | Yes |
| Skin temperature | Yes | — |
| Temperature sensor | Yes | — |
| Sleep tracking | — | Yes |
| Sensors | Accelerometer, gyro, compass, barometer, heart rate, SpO2, thermometer (skin temperature), body composition (BMI) | Accelerometer, gyro, compass, barometer, heart rate, SpO2 |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Dual-band GPS | Yes | Yes |
| Satellite systems | GLONASS, GALILEO, BDS, QZSS | GLONASS, GALILEO, BDS, QZSS |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Connectivity | ||
| NFC payments | Yes | Yes |
| LTE (cellular) | No | Yes |
| eSIM | No | Yes |
| Bluetooth | 5.2 | 5.3 |
| Smart features | ||
| Calls from the wrist | — | Yes |
| Speaker | Yes | Yes |
| Platform | ||
| Operating system | Proprietary OS | HyperOS 2 |
| Platform | Proprietary | Proprietary |
| Works with | — | iOS, Android |
