SANOXY 2.4G Wireless Compact Optical Precise Mouse for Computer/Laptop-exchangeable 500/1000 DPI High Resolution Computer Mouse (GRAY) SANOXY Wireless Optical Mouse 2.4GHz with mini USB receiver Compatible OS: Windows, Mac OS RF frequency: 2.4 Ghz Resolution: 500-1000 DPI OS System: Windows 2000 / XP / Vista / Win 7 , Mac OS Ergonomically designed, comfortable to grip and use With On/Off power switch