Keyboard specifications interface usb dimensions 442mm x 141mm x 21mm l x w x h number of keys 104 keys keyboard weight 400acircplusmn20g key pitch 190 mm colour full black cable length 1500mm compatible with windows 982000mexpvistawindows 7 key switch life test conditions full travel 150g force 5 million life cycle times minimum mtbf mean time between failure in life test 8 million life cycles working voltage 45 v to 55v working current 35ma operation temperature