You Can Use The A1 Smart Watch To Make Or Answer Calls. The Watch'S Built-In Speaker Allows You To Listen To Your Favorite Music Anywhere. Bluetooth Dialer,Pedometer,Sleep Monitor,Sedentary Reminder,Music Player,Alarm Clock, Watch,Camera,Remote Camera,Bluetooth Sms/Message Notifier,Message Reminder,Call Reminder,Answer Call,Dial Call,Nfc For Quick Pairing. Sync Function: Whats App, Twitter,Facebook;Time,Schedule,Read Message Or News;Entertainment: ,Camera.Bluetooth Connection Support Ninety Nine Percent Of Mobile Phone Market Samsung,Htc,Nokia,Motorola, Most Have Bluetooth Function And Mobile Phone Can Use. Shut Down Automatically, The Charge Time Need 1-2 Hours, This Product Only Work In Sim And Without I Pin Security It Work.Once The Sim Is Inserted In The Sim Slot.