Expands the lindy 2 port usb wireless km switch into a four port version 2 4ghz wireless km switching via hotkeys mouse or taskbar icon smart software allows you to switch devices simply by sweeping across screens copy paste text between devices control your android phone or tablet using a computers pc and mouse compatible with usb hid systems windows xpvista78 mac os 10 5 linux please note this expansion kit must be used in conjunction with the lindy 2 port usb wireless km switch