Retractable mobile mouse gives you all the reliability of a wired mouse with none of the cable clutter. Advanced Blue Optical sensor tracks on more surfaces than standard optical sensors. The retractable cord means that when you're ready to work - wherever that may be - so is the Pro Fit mouse. Design includes battery-free operation and scroll wheel. Plug-and-play operation requires no software. Mouse works with right-handed or left-handed use and is compatible with PC and Mac.