BT V2.1 +EDR
  Playback time 14 hours* (50% volume with 128 kbps bit rate files)
  Charging time    2.5 hours*
  Range Max 10 meters*
  Built-in rechargeable Lithium battery
  Power/ON/OFF/Mode/Pause/Pre/Next/Volume control keys
  Adjustable headband
  Can be used as wired headphone
  Package Contents
  BT headphone
  Charging cable
  Audio cable
  Charging adapter
  User Manual