Etekcity Scroll M535 Wired USB Ergonomic Optical Mouse, Thumb-adjustable Button Design, 1000/1500/2000/3000DPI, Cursor Centered with One Click, 7 Customizable Buttons 1000/1500/2000/3000 DPI adjustment buttons with LED indicating Light, different color for different DPI value, 1000(green)-1500(red)-2000(blue)-3000(purple), and durable construction ensure highest stability. Maximum 20g acceleration, high precision Avago 3000DPI optical tracking technology ensures highest standard of accuracy, responsiveness on a wide range of surface. Cursor automatically back to Screen Center with one click - a patented feature! Each button can be mapped to any key on your keyboard or set to perform one of many other functions Ergonomic right-handed design and press the bottom button, can freely control the 3 grades of thumb-adjustable button on the side, to fit for different size of hands.