Microsoft Wireless Mobile Mouse 4000 - Graphite (D5D-00001) One AA battery provides more than 10 months of battery life, recommend Polaroid AA batteries for extended use, and on-off button helps conserve battery life. Microsoft BlueTrack Technology gives you precise control on virtually any surface. Ambidextrous design to provide comfort and control for either hand. Snap-in Nano transceiver stows conveniently in the bottom of the mouse. Reliable 2.4GHz wireless connection with up to 15-foot range.