Wireless convenience: No more wires with the reliable 2.4 GHz wireless connection. Built to last: Strict HP standards and guidelines ensure long-lasting quality. Contoured comfort: A contoured shape designed for all-day comfort in either hand. Good to go: With 2 AAA batteries included and no software to install you’re good to go. Reliability you can count on: Red LED technology and a 1,000 dpi optical sensor give you exceptional accuracy and speed across a wide range of surfaces.