Support: Bluetooth 4.0 and aboveAndroid 4.3 and above or Bluetooth 4.0 and above， IOS7 aboveFunction:Passometer，Fitness Tracker，Sleep Tracker，Message Reminder，Call Reminder，Waterproof.Compatibility: IOS， Android platformBluetooth: SupportThe standby time : 15 days feature ? Bluetooth dialing: You can make a phone call via Bluetooth.? Hand-free calls: With a wireless Bluetooth headset， you can make hand-free calls. When you do ?sports， driving， it is convenient for you to answer a call.? Call reminder: X2 will vibrate when a call is coming， you never will miss a important call.? Sport tracking: Record your sports data， distance， steps and calories. It will still track your sport during a phone call.? Sleep monitoring: Monitor your sleep quality and help you develop a good living habits.? Enjoy music: It is always fun and comfy to listen to the music on your Bluetooth headset.? Support system: X2 supports Android 4.3 / iOS 6.1 and above system， Bluetooth 4.0. package 1 x Bluetooth Sync Bracelet Watch1 X Usb cable1 X User Manual