FitBit Charge 4 Black
Track heart rate, sleep quality and active minutes with this sleek black wristband. It offers GPS distance, altimeter, waterproof to 50 m, 5‑hour battery in GPS mode, Bluetooth 4, two removable straps, 30‑day memory, NFC pay, Android/iOS compatible.
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Back Market UK 
Quzo | Brand | Fitbit |
| EAN | 0811138038670 |
| ASIN | B09NDYWLJW |
| MPN | FB417BKBK-FRCJK |
| SKU | FB417BKBK-FRCJK |
| Active minutes | Yes |
| Band colour | Black |
| Band size | S/L |
| Battery life (GPS mode) | 5 h |
| Battery technology | Lithium Polymer (LiPo) |
| Bluetooth range | 9 m |
| Bluetooth version | 4 |
| Cables included | USB |
| Charging time | 2 h |
| Closure type | Single prong strap buckle |
| Device type | Wristband activity tracker |
| Display diagonal | 3.96 cm (1.56") |
| Heart rate sensor type | Optical |
| Housing material | Plastic, Stainless steel |
| Maximum strap length | 22 cm |
| Memory capacity | 30 day(s) |
| Minimum strap length | 14 cm |
| Mobile operating systems supported | Android 10,Android 7.0,Android 7.1,Android 7.1.2,Android 8.0,Android 9.0,iOS 12,iOS 13 |
| Operating altitude | 0 - 8535 m |
| Operating temperature | -20 - 60 °C |
| Suggested gender | Unisex |
| Waterproof up to | 50 m |