Dimensions
Size comparison
C4BT103
| C4 | BT103 | Difference | |
|---|---|---|---|
| Case size | 51 mm | 40 mm | +11 mm |
| Thickness | 9.8 mm | 10.9 mm | −1.1 mm |
| Weight | 45 g | 100 g | −55 g |
Drawn to the same scale from the official dimensions (front and side).
Why is C4 better than BT103?
- Weight45 g vs 100 g2.2×
- Screen size2.01″ vs 1.91″+5%
- Thickness9.8 mm vs 10.9 mm+11%
Why is BT103 better than C4?
- Resolution (width)296 px vs 320 px+8%
Specifications
Side by side
| Design & durability | ||
| Case size | 51 mm | 50 mm |
| Weight | 45 g | 100 g |
| Thickness | 9.8 mm | 10.9 mm |
| Height | — | 49.5 mm |
| Width | — | 40 mm |
| Lens / cover glass | — | Tempered glass |
| Water resistance | 2 ATM | — |
| Colours | — | Black, White |
| Display | ||
| Screen size | 2.01″ | 1.91″ |
| Display technology | — | LCD |
| Panel | — | TFT LCD |
| AMOLED / OLED display | — | No |
| Resolution (width) | 296 px | 320 px |
| Resolution (height) | 240 px | 380 px |
| Pixel density | — | 260 ppi |
| Refresh rate | — | 60 Hz |
| Battery | ||
| Battery life (smartwatch mode) | 10 days | — |
| Battery capacity | 300 mAh | 300 mAh |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Sleep tracking | Yes | — |
| Sensors | — | Accelerometer, heart rate, SpO2 |
| Sports & navigation | ||
| Built-in GPS | — | No |
| Connectivity | ||
| NFC payments | — | No |
| LTE (cellular) | — | No |
| eSIM | — | No |
| Bluetooth | — | 5.2 |
| Smart features | ||
| Calls from the wrist | Yes | — |
| Speaker | — | No |
| Platform | ||
| Operating system | — | Proprietary OS |
| Platform | — | Proprietary |
| Works with | Android, iOS | — |
