With the Logitech® M570 wireless trackball, you work in comfort with a stable, sculpted trackball that gives your hand all-day support and total cursor control. Simply plug in the tiny, leave-in Logitech® Unifying™ receiver for long-range, advanced 2.4 GHz wireless connectivity of your mouse. You'll get up to 18 months of use from a single AA battery, an integrated scroll wheel so you can easily move up and down through Web pages and long documents, plus programmable and back-and-forth buttons to help you do what you want to do faster.