All day activity tracking sleep pattern monitoring calories consumption record silent alarm and sleep reminder fitness goals gamifications easy to read charts and graphs 15 days long battery life dermatologically safe soft touch material 18 grams lightweight design IPX6 waterproof rating How: transceiver: BT 4.0 (2.4Ghz RF) 3-axis accelerometer with advanced motion-recognition vibration actuator display: 21 LED array physical properties weight: 18grams strap length: 155 mm -210 mm (adjustable) memory and syncing stores up to 7 days motion data BT LE- Bluetooth low energy wireless sync data between star.21 and smartphone smartphones requirements iOS 7.0 and above android 4.3 (Jelly bean) and above Bluetooth 4.0 batteries and power battery life: up to 15 days battery type: lithium-polymer capacity: 50 mAh charge time: one and a half hours charging: micro USB port via micro USB cable environmental requirements waterproof rating: IPX6 -resist against heavy splashing and rain operating temperature:-20°C ~ 45°C storage temperature: -30°C ~ 60°C package includes star.21 fitness band micro USB charging cable (20mm) User manual.
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