Ultra-Slim Mini USB 2.4G 2.4GHz Wireless Mouse Optical for PC MAC Laptop Desktop Black owered by 2xAAA battery (not included) ,ON/OFF switch Automatically power saving Smooth,rubberized grip ergonomic design 2.4GHz Wireless USB Wheel Optical Mouse Compatible with ,Windows XP / VISTA / Win7 / Win8 / MAC Plug in nano receiver and go wireless2.4GHz reliability and performance;Works on most surfaces except glassWorking range within 10 meters Wireless : Plug in nano receiver and go wireless. 2.4GHz reliability and performance.