Function Description:
  Programme: Broadcom20730 Bluetooth chip
  Frequency: 2.402GHz to 2.480GHz
  Operating distance: 10 (m)
  Bluetooth Version: 2.0
  Keyboard Format: US
  Work Time: within 60 hours
  Standby time: 250 hours
  Charging time: 4 hours
  Bluetooth Keyboard + 360 ° rotation