Logitech 910-001799 M570 Wireless Trackball, Four Buttons, Scroll, Black/Blue by LOGITECH, INC.

With the 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 battery life, an integrated scroll wheel, plus programmable and back-and-forth buttons to help you do what you want to do faster. Connector/Port/Interface: USB; Left/Right Hand Use: Right; Mouse Technology: Laser; Wired/Wireless: Wireless. Black/Blue Sold per Each.