bKeyboard Specifications/bbr /br /liInterface USB and PS/2 Combo/liliDimensions 443mm x 139mm x 26mm W x D x H/liliNumber of Keys 105 Keys/liliKeyboard Weight 500g/liliKey Pitch 19.0 mm/liliColour Full Black/liliCable Length 1.2mm/liliOS Support Microsoft Windows 2000/ME/XP/Vista/7/8/8. 1/10 or higher Linux Mac/liliKey Switch Life Test conditions Full travel 557g force 1 Million life cycle times Minimum/liliMTBF Mean time between failure in life test over 3 million keystrokes/liliWorking Voltage 4.8 V to 5.5V/liliWorking Current 35mA/liliOperation Temperature Range 045C 20 90 RH/liliStorage Temperature Range -2060C 880495 RH 408451/li