This Bluetooth watch can be used as a watch or call alert Main Functions: Caller's name and number display Unconnection warning after 5-10M(vibration warning) Incoming vibration for alert Answer/conversation/dialing/hang up Synchronization/check/wipe data Time display Bluetooth Version: V2.1 Charger specification: Input Voltage: 110~240V Frequency: 50-60Hz Output Voltage: 5V Output current: 500mA Package included: 1 x Bluetooth watch 1 x USB charger 1 x User Manual