Stay connected with the Evoluent VM4L Vertical Mouse 4 (Wired). It features a patented shape that supports your hand in an upright neutral posture to prevent forearm twisting. Thoughtfully sculpted for uncompromised comfort, the Evoluent mouse features easy-to-reach programmable buttons. It also features easy-to-reach pointer speed controls on the side that allow for convenient adjustment without even releasing your grip from the mouse. The thumb rest has been reshaped to provide even more comfort over earlier versions, while the top-mounted LEDs show through the chrome thumb rest to indicate the selected pointer speed. This left-handed mouse has a new bottom thumb button that provides greatly extended functionality when used with the included driver.