The blue M510 Wireless Mouse from Logitech is a full-size wireless laser-grade mouse that features a scroll wheel, with left/right scrolling, as well as forward and back buttons. Laser tracking allows for multi-surface precision tracking, and a leave-in USB receiver lets you enjoy wireless freedom. The USB receiver supports Unifying technology allowing you to connect other compatible devices (available separately) to it, eliminating the need for additional USB receivers. This mouse offers programmable controls to customize button functions. Soft side grips and a contoured shape allow for comfortable use. This mouse is powered by two preinstalled AA batteries that last for up to two years depending on use. The mouse also has an On/Off switch to conserve battery life when not in use.