Sanoxy 2.4G Wireless Slim Flat Optical Mouse 500/1000 Exchangeable DPI High Resolution Computer Mouse, Black (SANOXY_WMOUSE-GR) SANOXY Slim flat top mouse body design, light and portable USB Wireless Mouse,Optical Wireless Mouse,Computer Mouse Compatible OS: Windows, Mac OS RF frequency: 2.4 Ghz Resolution: 500/1000 DPI Can be Exchangeable by Clicking the Button next to the Roller OS System: Windows 2000 / XP / Vista / Win 7 , Mac OS Ergonomically designed, comfortable to grip and use With On/Off power switch