Adesso iMouse M20R - Wireless Ergonomic Optical Mouse

2.4 GHz Radio Frequency Wireless Technology - With 2.4 GHz RF wireless technology you can enjoy working at any angle and at a distance of up to 30 feet. Adjustable DPI Switch - 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. Ergonomic Design - The iMouse M20R ergonomic design provides a comfortable grip and eliminates hand strain, while giving great cursor control. Battery-Saving - Use the battery-saving on/off power switch on mouse base to extend battery life and reduce the need to change batteries. Internet Navigational Buttons - 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.