Black Bluetooth Smart Band with Call Alert records sports data in the daytime and sleeping data at night for healthy living. Receive incoming calls with Caller ID. 0.49″” OLED screen display shows steps, calories, distance, time and sleep quality. Host syncs via wireless Bluetooth 4.0 or via USB to connect to PC. Compatible with iOS Apple iPhone 4/4S/5/5C/5S and othe Bluetooth devices. Wirelessly uploads your data to your phone or computer to gain a deeper insight on daily fitness or monthly sleep levels with free online graphs and charts. Auto sleep and silent alarm, Water resistant, rechargeable lithium ion battery. No Battery or external power required, recharges when plugged into computer.