iPazzPort Mini Wireless Keyboard with Backlit and Touchpad for Android TV Box and Raspberry Pi 3 and HTPC KP-810-21TL 2.4GHz wireless connection via the included usb dongle , plug it into usb port and work soon QWERTY with 92 keys, wireless keyboard with touchpad supporting multi-touch function , mouse left and right buttons, easy to type and copy/paste Wireless mini keyboard built in rechargeable lithium-ion battery , last up to several weeks after fully charged , safe and save energy Small and handheld design, innovative Shape, perfect for raspberry pi 3, android tv box , htpc and pc If can't work or lost connection,re-sync keyboard with dongle as the steps in manual