EH0254B Features RF 2.4G connection USB transceiver， supports plug and play Equipped with LED backlight for operation in dark rooms QWERTY keyboard layout Increases the code function and eliminates radio interference Built-in rechargeable lithium battery Can be widely used for family entertainment， education and training， conference presentation， onboard computer， projector instrument， PC network， KTV VOD system or Google TV box German operation General Specs Brand & Model iPazzPort  Wireless Type 2.4G RF Transmit Power Up to 4dBm Working Voltage 3.7v Operating Current ＜50 mA Charging Voltage 4.2-5.05v Charging Current ＜350 mA Sleep Current ＜ 1mA Working Distance 10-33 meter radius Battery 800mA rechargeable lithium battery System Required Windows 2000/XP/Vista/7/CE Linux/Android/MAC Android PCs Language German Dimensions 125.5 x 56.5 x 12 mm Weight 81.5 g Package Details Weight: 233.26 g Size: 18.5*9.5*4.00 cm Package Includes * iPazzPort KP-810 2.4G RF 82-key Mini Wireless Keyboard & Air Mouse (German)