Dimensions
Size comparison
C21X5
| C21 | X5 | Difference | |
|---|---|---|---|
| Height | 46.5 mm | 53.9 mm | −7.4 mm |
| Width | 46.5 mm | 45.4 mm | +1.1 mm |
| Thickness | 13 mm | 14.4 mm | −1.4 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is C21 better than X5?
- Pixel density386 ppi vs 304 ppi+27%
- Thickness13 mm vs 14.4 mm+11%
Why is X5 better than C21?
- Built-in GPSNo · C21: Yes
- AMOLED / OLED displayNo · C21: Yes
- Screen size1.32″ vs 2.13″+61%
- Battery capacity300 mAh vs 900 mAh3×
- SpeakerNo · C21: Yes
- Resolution (width)360 px vs 410 px+14%
Specifications
Side by side
| Design & durability | ||
| Case size | 46 mm | 54 mm |
| Weight | — | 84 g |
| Thickness | 13 mm | 14.4 mm |
| Height | 46.5 mm | 53.9 mm |
| Width | 46.5 mm | 45.4 mm |
| Lens / cover glass | Corning Gorilla Glass | — |
| Water resistance | — | 3 ATM |
| Ingress protection | IP68 | — |
| Water resistance (IPx) | IPx8 | — |
| Colours | Black, Silver | Black |
| Display | ||
| Screen size | 1.32″ | 2.13″ |
| Display technology | LCD | AMOLED |
| Panel | TFT LCD | AMOLED |
| AMOLED / OLED display | No | Yes |
| Resolution (width) | 360 px | 410 px |
| Resolution (height) | 360 px | 502 px |
| Pixel density | 386 ppi | 304 ppi |
| Refresh rate | 60 Hz | 60 Hz |
| Battery | ||
| Battery capacity | 300 mAh | 900 mAh |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Sensors | Accelerometer, heart rate, SpO2, blood pressure | Accelerometer, heart rate, SpO2 |
| Sports & navigation | ||
| Built-in GPS | No | Yes |
| Connectivity | ||
| NFC payments | No | No |
| LTE (cellular) | No | No |
| eSIM | No | No |
| Bluetooth | 5 | 5.3 |
| Smart features | ||
| Speaker | No | Yes |
| Platform | ||
| Operating system | Proprietary OS | Proprietary OS |
| Platform | Proprietary | Proprietary |
