3.9Display3.5
5.0Health tracking5.0
Dimensions
Size comparison
U1Watch 4000
| U1 | Watch 4000 | Difference | |
|---|---|---|---|
| Case size | 42.4 mm | 46 mm | −3.6 mm |
| Thickness | 11.4 mm | 11 mm | +0.4 mm |
| Weight | 44 g | 39 g | +5 g |
Drawn to the same scale from the official dimensions (front and side).
Why is U1 better than Watch 4000?
- Screen size1.93″ vs 1.65″+17%
Why is Watch 4000 better than U1?
- Built-in GPSNo · U1: Yes
- Weight43.8 g vs 39 g+12%
- Thickness11.4 mm vs 11 mm+4%
Specifications
Side by side
| Design & durability | ||
| Case size | 50 mm | 46 mm |
| Weight | 43.8 g | 39 g |
| Thickness | 11.4 mm | 11 mm |
| Height | 49.8 mm | — |
| Width | 42.4 mm | — |
| Case material | — | Stainless steel |
| Strap material | — | Kunststoff |
| Water resistance | 1 ATM | — |
| Colours | Black, Pink | Black |
| Display | ||
| Screen size | 1.93″ | 1.65″ |
| Display technology | LCD | LCD |
| Panel | TFT LCD | LCD |
| AMOLED / OLED display | No | No |
| Resolution (width) | 240 px | — |
| Resolution (height) | 288 px | — |
| Pixel density | 194 ppi | — |
| Refresh rate | 60 Hz | — |
| Battery | ||
| Battery life (smartwatch mode) | — | 6 days |
| Battery capacity | 300 mAh | 300 mAh |
| Battery type | — | Li-Po |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Sleep tracking | — | Yes |
| Sensors | Accelerometer, gyro, heart rate, SpO2 | heart rate, SpO2, accelerometer |
| Sports & navigation | ||
| Built-in GPS | No | Yes |
| Satellite systems | — | GPS |
| Connectivity | ||
| NFC payments | No | — |
| LTE (cellular) | No | — |
| eSIM | No | — |
| Bluetooth | 5.4 | 5.3 |
| Smart features | ||
| Speaker | Yes | — |
| Voice assistant | — | Yes |
| Platform | ||
| Operating system | Proprietary OS | — |
| Platform | Proprietary | — |
| Works with | — | iOS, Android |
