3M Wired Ergonomic Optical Mouse, Patented Vertical Grip Design Keeps Your Hand and Wrist at a Neutral Angle for Comfort, USB/PS2 Plug and Play Compatibility, 6.5' Cord, Large Size, Black (EM500GPL) The 3M Ergonomic Mouse has earned an Ease-of-Use Commendation from the Arthritis Foundation for its patented, vertical grip design that keeps your hand and wrist at a neutral angle, while the mouse works as a regular optical mouse Vertical grip design that keeps your hand and wrist at a neutral angle, while the mouse works as a regular optical mouse Use your thumb to left and right click Optical sensor, USB/PS2 plug and play compatibility and a 6.5 feet 2 year warranty