Minicute EZmouse3 2.4G Wireless Vertical Ergonomic Laser Mouse, 400 / 800 /1600 DPI, 5 Buttons - Right Hand Ergonomic, Comfortable and durable Five buttons, Included with forward and back button. Laser positions, works on virtually any surface. Your mouse will work anywhere including granite, carpet, and rough grain wood. Adjustable DPI Function, which the switch button is on the bottom of the mouse. DPI can be changed from 400~800~1600. 2.4 GHz wireless delivers a reliable connection with up to a 10m range, with virtually no interference.