shape and materials Enjoy a contoured shape with gently curved sides, broad palm area and soft rubber grips. Extra controls right under your fingers You can do more, faster with Back/Forward buttons, side-to-side scrolling and zoom. 2-year battery life With On/Off switch, smart sleep mode and battery life indicator, you might just forget this mouse runs on batteries.1 Unifying technology - Plug it. Forget it. Add to it. You can connect up to six Unifying devices to this tiny receiver.2 Back/Forward buttons Moving quickly through documents or browsing your favorite websites is a breeze with buttons conveniently located under your thumb. Side-to-side scrolling plus zoom Scroll side-to-side in documents or zoom in and out of photos and spreadsheets with a flick of your finger. Programmable controls You can configure the controls to make them to do exactly what you want like switching applications, opening browser windows or jump to full screen while watching videos. Connect with ease Plug the tiny Logitech Unifying receiver and leave it there. Plus, you can add up to six Unifying devices to it.1 Advanced precision Enjoy precise cursor control and responsive tracking on just about any surface.2