Bluetooth Keyboard for Pro3, Pro4 Multi-Function Keyboard cover with Touchpad            Specially designed for Surface pro 3 & Surface pro 4.  Scissor type keyboard,good typing.                                Uses USA BROADCOM Bluetooth module3.0 Standard MICR interface      Lithium Battery Capacity:250mAh                                      60 hours continuous use per charge                                                                                   Size:295x216x7.8mm                                                           Net weight:335.4G