3M Wired Ergonomic Optical Mouse, Vertical Grip Design Keeps Your Hand and Wrist at a Neutral Angle for Comfort. Like new condition, incl instructions. This mouse is clinically proven to alleviate pain and discomfort of repetitive stress injuries in the hand, wrist or arm associated with the use of traditional mice - which requires forearm pronation and may cause pressure on the wrist and carpal tunnel area. Grip the handle and rest your hand on the base.