... used with Android TV Box/Dongle Stick Fly mouse remote control 2.4G Mini Wireless Keyboard & Air mouse ... speed and meet different systems demand;4.Wirelss(2.4G RF) transmit technique,smart & convenient, USB receiver, plug ... on the Main Keyboard, and enter FN + F1(RF) keys, now the up right side yellow light ... range: 10M(Semidiameter) 2.Transmit way:2.4G RF 3.Working voltage:3.3V 4.Battery capacity:500mAH ...