Orbit USB Trackball for Mac features the plug-and-play ease of USB. Additionally, it includes all of the features of Kensington's Orbit trackball - the number one selling trackball for the Mac market - such as easy fingertip control, a symmetrical design for use by right- and left-handed individuals and the ability to program the trackball with individualized functions using the award-winning MouseWorks software. ??Mouse-in-a-Box USB Mac also features the plug-and-play ease of USB as well as the same point-and-click simplicity made popular by Kensington's Mouse-in-a-Box line of mice. The new Mouse-in-a-Box USB Mac has one button to make it easy to use and does not require software for programming.