The Cherry MW 4500 USB Wireless Vertical Mouse has a more natural hand posture and helps to reduces the risk of wrist problems. The angled shape of the mouse corresponds to the natural, relaxed position of the wrist so there is less strain on your tendons. The mouse is suitable for left handed users. Two additional thumb buttons let you move back and forth in your web browser, and with the aid of the Cherry Keys software you can individually assign copy and paste functions. To adjust the speed, the resolution can be set with a button in 3 levels up to 1200 dpi.