|  |  | Features Calorie, Distance, Step pedometer, Sleep monitor, Sedentary alert, Call alert , Alarm alert, SMS alert, Goal progress, Achieve goal reminder, Health data share, Wrist sense, Camera remote control, Anti lost. Specifications Working voltage: 3.6~4.2V Alarm clock: Yes Call Reminder SMS Reminder Battery Indication: Battery status displayed on screen and Veryfit for heart rate app. Goal progress Achieve goal reminder Sleep monitor Anti-lost Camera remote control Sedentary Alert Wrist sense CPU: Nordic Sensor: Kionix Bluetooth: BLE 4.0 Memory: 16KB RAM + 256KB ROM Strap Material: TPE Strap Size: 240x16x10mm Weight: 18g Battery: 50mAh Li-polymer Standby time: more than 7 days Charging Time: About 1-2 hours Charging port: USB Data Storage: 7 days Standard Packing: 1 smart bracelet, 1 user manual SYNCHRONIZE WITH THE FOLLOWING DEVICES iPhone 4S, 5/5C/5S/5SE/6/6S/6 Plus/ 6S Plus/ 7/ 7 Plus iOS 7.1 above and Android system 4.4 or above, Bluetooth 4.0+ smartphones |