Amemo 2.4G Wireless Optical Mouse with 800/1200/1600 DPI switch/Mice for Windows XP Win 7 Vista PC Laptop + USB Receiver for PC/Laptop (Red) Contoured shape with soft rubber grips provide all-day comfort Ultra slim, compact and lightweight, easy to carry. light slim design. 2.4GHz wireless transmission up to 10 meters operating distance. Comes with a tiny Amemo USB receiver that stays in your computer - plug it in, forget it Compatibility: Works with Windows XP, Windows Vista or Windows 7 Mac OS X 10.4 or later USB port