V7 Standard Full size 3 Button PS2 Optical Mouse with Scroll Wheel for Desktop and Notebooks (M30P20-7N) - Black 1000 DPI resolution Comfortable contoured grip N/a Full size contoured design with textured side grips, provides seamless point and click interaction with reduced wrist fatigue. 1000 dpi optical LED sensors provide precise, swift and reliable cursor movement with easy text selection 3 buttons including a built-in scroll wheel for easy navigation so you can speed through long documents or web pages. Easy installation with Plug and Play PS2 wired connection - cable length 4.9" Enhanced tactile button and tracking feedback for high-volume workload Compatible operating systems: Windows 2000, XP, Vista or Windows 7 , Windows 8. Mac OS X 10.X or later