TouchpadThis product innovatively adds the function of the mouse wheel. When you press the Fn key, touch any position k of the sliding area with your finger, and the mouse wheel function can be realized conveniently. This user-friendly design makes it easier and better to browse the web and edit documents. Connect the receiverSlide the receiver out from the side of the keyboard and plug it into a device with a standard USB port. Once connected, slide the power switch to the "ON" position on the left side of the device to establish the connection. Auto sleep and wake up functionThe keyboard also has auto-sleep and auto-wake modes. The keyboard will automatically enter sleep mode after a long period of inactivity. During sleep mode, the user can wake up the device by pressing any key. 2. The 4 GHz receiver and keypad RF lights will continue to blink and will not turn off. Close the keyboard after useWhen you're done using the keyboard, slide the switch to the off position. This will power off the keyboard. The USB receiver should be unplugged from the PC and plugged back into the keyboard for safekeeping. Install AAA*2 batteries (please bring your own), this version does not support charging function. Parameter specification:Dimensions (L x W x H): 146.8x97. 5x19mmWeight (grams): 110gWorking range: up to 10 meters Transmission power: +5db max.Working voltage: 3.3V Working current: <50mA Charging current: <300mA Sleeping current: <1mA Computer system requirementsWindows 2000WindowsXPWindows VistaWindowsCEWindows 7Linux (Debian-3.1, Redhat-9.0 Ubuntu-8.10Fedora-7.0 tested)