Dimensions
Size comparison
C4BT101
| C4 | BT101 | Difference | |
|---|---|---|---|
| Case size | 51 mm | 46.1 mm | +4.9 mm |
| Thickness | 9.8 mm | 13.3 mm | −3.5 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is C4 better than BT101?
- Battery life (smartwatch mode)10 days vs 7 days+43%
- Water resistance2 ATM vs 1 ATM2×
- Thickness9.8 mm vs 13.3 mm+36%
Why is BT101 better than C4?
- Battery capacity300 mAh vs 410 mAh+37%
- Resolution (width)296 px vs 320 px+8%
Specifications
Side by side
| Design & durability | ||
| Case size | 51 mm | 58 mm |
| Weight | 45 g | — |
| Thickness | 9.8 mm | 13.3 mm |
| Height | — | 58.3 mm |
| Width | — | 46.1 mm |
| Lens / cover glass | — | Tempered glass |
| Strap material | — | Silikon |
| Water resistance | 2 ATM | 1 ATM |
| Water rating (maker) | — | 50 m / 5 bar / 5 ATM |
| Colours | — | Black |
| Display | ||
| Screen size | 2.01″ | 2.02″ |
| Display technology | — | LCD |
| Panel | — | TFT LCD |
| AMOLED / OLED display | — | No |
| Resolution (width) | 296 px | 320 px |
| Resolution (height) | 240 px | 390 px |
| Pixel density | — | 250 ppi |
| Refresh rate | — | 60 Hz |
| Battery | ||
| Battery life (smartwatch mode) | 10 days | 7 days |
| Battery capacity | 300 mAh | 410 mAh |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Sleep tracking | Yes | — |
| Sensors | — | Accelerometer, heart rate, SpO2, blood pressure, barometer, compass |
| Sports & navigation | ||
| Built-in GPS | — | No |
| Barometric altimeter | — | Yes |
| Compass | — | Yes |
| Connectivity | ||
| NFC payments | — | No |
| LTE (cellular) | — | No |
| eSIM | — | No |
| Bluetooth | — | 5.3 |
| Smart features | ||
| Calls from the wrist | Yes | — |
| Speaker | — | Yes |
| Platform | ||
| Operating system | — | Proprietary OS |
| Platform | — | Proprietary |
| Works with | Android, iOS | iOS, Android |
