Features 1、Upgraded ergonomic design, waist diamond-shaped pattern, prevent palm sweating after long time holding, vertical mouse fit palm and finger, reduce discomfort when using, goodbye /"mouse hand/". 2、3 adjustable movement speed (800-1200-1600DPI), easy to switch, adapt to various material surfaces, accurate and reliable location, to meet your daily office needs. 3、Powerful optical engine provides accurate click, fast response and stable signal. Specification Features: Upgraded ergonomic design, waist argyle pattern to prevent your palms from sweating after holding for a long time, vertical mouse fit palm and fingers, reduce the discomfort of use, goodbye "mouse hand". 3 adjustable DPI (800-1200-1600DPI), easy to switch, adapt to various material surfaces, accurate and reliable location, to meet your daily office needs. Powerful optical engine provides accurate click, fast response and stable signal. Exquisite treatment, feel comfortable. USB power supply, plug and play, easy to use. Specification: Type: Vertical mouse Color: Black Connection mode: USB cable Key number: 6 DPI:800-1200-1600DPI Item size: 138*75*68 MM/5.43*2.95*2.68 inches Weight: About 122g System support :Windows 2000, , Windows 7, Windows , Windows 98, Mac OS, Windows ME, Windows 8, Windows 10, etc Packing list: 1 * Mouse Package List 1 * Mouse