SANOXY&reg; Nano 2.4G Wireless Optical Mouse with DPI switch/Mice for Windows XP Win 7 Vista PC Laptop + USB Receiver for PC Laptop (SILVER) Operation systems: Windows 98, 2000, ME, XP, Vista, Win 7 and more Ultra slim, compact and lightweight, easy to carry. light slim design. Ideal laptop and desktop companion for home and office use. Powered by 1 x AA Alkaline battery. (battery NOT included) 2.4GHz wireless transmission up to 10 meters operating distance. helps you control computer from a distance, freely with no cords