Ergonomic Vertical Design: Unique vertical mouse with special volute bionic design alleviates arm discomfort and stiffness Entry level ergonomic vertical mouse: Special curve backside, thumb groove, delicate buttons layout and anti-skid rubber coasting help you easier and more comfortable to adapt the use of vertical mouse, Comfortavble Grip 4 Shift DPI: 800-1200-2400-3200(default 4 level), up to 4200DPI set via driver, which would be easily change according your daily working requirement by the switch in the TOP, and more with 1000 polling rate, fast response Removable wrist rest: Let your forearm and mouse to be a whole part and make you wrist lifted from the ground which protect you wrist from friction when moving the mouse [All products include 12 months warranty and free lifetime technical support] Wide Compatibility: Compatible with Windows XP, Vista, 7, 8,10 operating system(Compared with traditional mouse, with unique ergonomic vertical design, it may take a few days to get used to using it)