2.4Ghz Wireless Mini Wireless Keyboard With Track Ball For TabletDescription:Features:You can tune up the volume of your music, pause your movie for a quick break without needing to get off the sofa.The keyboard features a track ball that provides full navigation without the need of a mouse, this all in one design makes it easier to scroll and click through the web.Size:26.5x11.5x1.5cmHow to use:When you get this wireless air keyboard,please open the battery case on the keyboard back.Please insert 2 PCS AAA alkaline batteries.Please find the mini USB receiver on the right of keyboard back.Please put the mini USB receiver into the USB port.After the keyboard is connected,you can use it freely.Tips:Fn+keys printed by blue letters can make this functions(blue letter)work.Notes:This keyboard works for Android,Windows,Mac system.This keyboard will be in sleeping mode without using a few minutes.Please take off the batteries if no use in a long time.Package includes:1x Keyboard