Extra one not needed. Still in box 3 in 1 multifunction wireless keyboard and touchpad. USB reciever Keyboard with Touchpad ,handle remote supports multi-finger functions,A single finger click as left mouse function, two-finger click as the right mouse function, double finger drag as the rolling screen. Wireless Keyboard Remote connection No Need Driver Plug &Play : Insert the USB receiver and Turn on ,this mini wireless touch keyboard could work well. Wireless mini keyboard remote perfect for Andriod TV Box, Google TV Box, Xbox360, PS3, HTPC/IPTV ,Android ,Windows, MacOS.