With 2.4 GHz RF wireless technology you can enjoy working at any angle and at a distance of up to 30 feet. Quickly and easily adjust DPI resolution (800/ 1200/ 1600) for a faster response with the convenient DPI Switch located at the top of your mouse. The iMouse M20 ergonomic design provides a comfortable grip and eliminates hand strain, while giving great cursor control. Use the battery-saving on/off power switch on mouse base to extend battery life and reduce the need to change batteries. Two Internet navigational buttons, back and forward, are conveniently located on the left side of mouse to provide you with Internet browser control with minimal hand movement. iMouse M20R - Experience new levels of productivity with the Adesso iMouse M20R 2.4 GHz RF Wireless Ergo Mouse. This 2.4 GHz Radio Frequency wireless mouse offers you 30 feet of wireless freedom and eliminates the constraints wired mice often cause. Its optical sensor tracking method lets you work on any surface with better speed and accuracy. In addition, the mouse includes three distinct levels of DPI resolution (800/ 1200/ 1600) for precise targeting (800 DPI), quick response (1200 DPI) or fast maneuvers (1600 DPI).