Fitbit fit bit Heart rate monitor Fitness wristband Charge2 Heart rhythm sleep VO2max Health care activity meter Active tracker Black Black L size

Sleep stage function: Automatically measures the time and waking time of each sleeping stage (awakening, shallow sleep, deep sleep, REM sleep) Sync: Wireless sync with Bluetooth Low Energy Wireless sync with PC, Mac Wireless sync with smartphone (iOS, Android) Charging: Power supply from USB using dedicated charging cable Continuous operation period: Maximum 5 days Waterproof: Waterproof Wrist band size: around the wrist 170 mm to 206 mm Included: Charging cable * Wireless USB dongle is not included. Compatibility: Bluetooth 4.0 or higher, iOS 9.0 or higher version, iphone 4s or later, 5, 5s, 5c, 6, 6 plus, etc. are supported. Compatibility: Bluetooth 4.0 or higher, Android 4.3 or higher version is also supported. * It does not guarantee the operation on all Android terminals.