Kensington Pro Fit Usb/Ps2 Full Size Wired Ergonomic Mouse Black

Ergonomic, right-Handed shape with soft rubber grip
Pointer speed quick-Select button
  Forward/Back buttons
  High-Definition optical sensor (Up to 2400 dpi) for responsive control
  Usb adapter for flexibility
  Plug and play – no drivers required
  Scroll wheel with middle button
  Built to last with a limited lifetime guarantee