FITBIT CHARGE 4 — Black

FITBIT CHARGE 4 Memory Save all your movement data for seven days, minute by minute Save daily total for last 30 days Stores heart rate data at one-second intervals during exercise monitoring and five-second rest of the time Waterproof Water resistant up to 50 meters After swimming or wetting the strap we recommend drying it, because like other wearables, it is better for your skin that the strap is clean and dry We do not recommend that you take your Fitbit Charge 4 in hot tubs or saunas Sync up Bluetooth LE Synchronization range: up to 9m Synchronization with mobile devices requires Bluetooth LE and Internet connection Syncs with computers running Mac OS X 12.2 and later, iPhone 5S and later, iPad 5th generation and later, and Android 7.0 and later Control music via Bluetooth LE on iOS and Android devices Environmental requirements Operating temperature: -20 to 60 ° C Maximum operating altitude: 8535 meters Battery and power Battery lasts up to 7 days, or up to 5 hours with GPS activated Battery life and charge cycles vary based on usage, configuration, and other factors; actual results will also vary We recommend that you charge your device every few days so that monitoring is continuous Battery type: lithium polymer Charging time (0-100%): two hours Radio receiver: Bluetooth 4.0 Dimensions Window diagonal 39.83 mm Box dimensions: 35.8 x 22.7 x 12.5 mm Small bracelet: Fits wrists between 140 and 180 millimeters in diameter Large bracelet: Fits wrists between 180 and 220 millimeters in diameter