Wireless mouse features plug-and-play simplicity to let you plug in the nano receiver & start using your mouse right away with no software or hassles. The tiny wireless receiver is so small & unobtrusive that you can plug it in & forget about it. Advanced 2.4 GHz wireless connectivity provides the reliability of a cord with wireless convenience & freedom without any delays or dropouts. 12-month battery life eliminates the hassle of frequent battery changes. The On / Off switch & smart sleep mode help conserve power for increased battery life.