GMYLE(TM) Black Wired Ergonomic Handheld 2.4GHz USB 2.0 Trackball Mouse for Windows XP/Vista / 7 / Mac OS with Multi DPI
Specifications:
USB 2.0 port
Compatible with Windows 98, 2000, XP, Vista, Mac OS Android and so on
Four group DPI 400,600,800,1200