Heart rate monitor:24 hours real time dynamic heart rate monitor, plan appropriate physical exercises. Activities tracking:Record daily steps, distance and calories consumption. Sleep monitor&Alarm:Automatically track your sleep quality, and alarm silent vibration will wake you up. Call alert:Caller name and caller ID will be displayed on OLED screen. Long standby:Standby time 7-10 days/4 days operating time. SNS notifications:Support SMS, WhatsApp, Facebook, Twitter, Wechat, and other social network site alert. Anti-lost:When your phone or the bracelet is beyond the range of Bluetooth(6M-10M), the device will vibrate to notify. Find phone:Long press the key to enter find phone interface, then double click the key, smart phone will vibrate or ring.Basic Specifications: CPU and Mainboard:Nrf51822 MPU6500 Megachips PAH8001EI Compatibility:For IOS8.0 + & Android 4.4 + Bluetooth:4.0 wireless sync to IOS and Android Product Strap Material:Leather Battery type:Polymer lithium battery Battery Capacity: 80mAh Standby:7~10 days Charging duration:1h Host Weight:25g 5i-Smart is a company special in smart bracelet for 3 years,very professional technology,own registered brand:izefia.Please feel free to contact with us by mail for customer service.