Ergonomics-Wireless MouseThe vertical wireless ergonomic mouse is designed to fit the size and contour of the palm, reducing the pressure on the palm and making your control of the wireless mice more comfortable and natural. Efficient and Sensitive-Easy to UseThe ergonomic mouse has 6 convenient buttons design, plug and play; Adjustable 800/1200/1600 DPI mouse movement speed. Optical tracking technology has higher sensitivity than standard optical mouse, usable Smooth and precise tracking on a variety of surfaces.