Features: 1. Windows multimedia control keys2. Switch between Air Mouse and Touchpad3. Wireless audio for online voice communication4. Built-in rechargeable lithium batteryParameters: 1. Size: 155x108x23mm2. Product weight: 151g3. Connect port: with USB 2.0 above4. RF mode: 2.4Ghz GFSK5. Power supply: Rechargeable polymer lithium-ion battery6. Charging Current: 300mA7. Standby current: 6μA (uA) System Requirements: -HID compatible device-Terminal with USB port-Windows 2000-Windows XP-Windows Vista, Windows CE,Windows 7, Windows 8-Linux-Android OS(with standard USB interface)Auto sleep The keyboard also features an auto sleep and auto wake mode. If they are is a long period of inactivity, the keyboard will automatically go into a sleep mode.During the sleep mode, the user can wake the unit up by pressing any key. The 2.4GHz receiver and keyboard's RF indicator will continue to flash and will not power down.Charging the battery(Configure A) The device with built-in lithium battery, please use only approved data lines and chargers.Fully charge the unit before operating for the first time. This device can be used when charging, but will extend the charging time; when the battery is low, the low voltage light will flash to warn user, the unit will automatically turn off if the battery has been depletedNotes: This product has A B three configurations can choose.Configure A: lithium battery version, this version built-in rechargeable lithium battery, additional charge USB line.Configure B: install AAAx2 battery, this version does not support the charging function.