specifications:Black colorWireless Technology: 2.403GHz - 2.480GHzOperating distance (Max): 10 meters without loss transmissionLayout: 90 keysTransmit Power: Max + 4dBmmultimedia button: Play / Pause、 Next Track、 Previous Track、 Home、 Email、 Internet、 Volume +、 Volume-、 Mute、 Mouse Left、 Right MouserCompatibility: Windows、 Mac and Linux laptop、 PC、 laptopVoltage drop: 4.2V - 5.05VDimensions: 160 x 145 x 30 mmWeight: 70gPackage Included:1 x 2.4GHz QWERTY keyboard1 x USB Receiver1 x USB charging cable1 x User Manual (English)Note:Not suitable without USB device and Linux TV Smarts update Version