Ergonomic Wireless Mouse offers a patented vertical grip that keeps your hand & wrist at a neutral angle while the mouse works as a regular optical mouse. Mouse is clinically proven to reduce muscle strain & discomfort associated with carpal tunnel syndrome & repetitive stress injuries. Ergonomic design earned an Ease-of-Use Commendation from the Arthritis Foundation. Mouse is easy to use. Simply grip the handle & rest your right hand on the base. Use your thumb to left & right click. With USB plug-and-play capability, mouse is easy to set up.