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Includes: Controller (CR2032 battery installed and rubber band attached), user manual NOTE(important): 1, Only Support iPhone and most android phones.Can only control the phone! 2, WARNING: It can not control CD player, can not control android navigation, can not control car audio or radio 3, Please read the Instruction Manual to set up your phone 4,Picture 5 is the Instruction Manual, Refer to picture 5 for functions, iPhone does not support "hang up" 5, If the Controller has been left idle for 30 minutes, it will switch to sleep mode, you can press any key to wake it up, it will automatically re-connected 6,In CarPlay mode, iPhone can't control the volume, so this controller can't control the volume either. This controller is essentially the extended Bluetooth keyboard of iPhone. 7, Turn on the Bluetooth of the mobile phone, press any key of the controller to automatically restore the connection, don't think it doesn't work, thank you