Move comfortably around your desktop with the Ergo Mouse. This wireless, desktop optical mouse features a modern, easy-grip design with a convenient thumb support. The super-smooth, rubberized grip is made for comfort and control so navigating your computer is a breeze. Plug in the nano receiver and go wireless with 2.4GHz reliability and performance. The nano receiver is small enough to plug in once and leave connected so it's great for computing on the go. Ergo mouse requires a USB 2.0 interface and a Windows 7, XP, 2000, Vista, or a Mac OS 10.4X and higher operation system. Mouse includes two AAA batteries.