The wrist-friendly contour of the vertical mouse allows you to hold your hand in a neutral "handshake position", minimizing the development of carpal tunnel syndrome. Adjustable DPI switch and back/forward buttons. Right hand orientation. Scroll wheel with 6 buttons. Plug-and-play mini USB receiver. 2.4 GHz wireless technology with On/Off switch and a range of up to 30 ft. Uses 2 "AAA" batteries (included). Black.