Pro Fit Mobile Wireless Mouse helps you work practically anywhere. The advanced Blue Optical sensor tracks accurately on more surfaces than standard optical sensors. Wireless mouse is constructed to survive the rigors of the road and the bumps and bruises of on-the-go use. Contoured buttons and sculpted sides mean no compromise on comfort. 2.4 GHz wireless technology delivers long-range performance and minimal interference. Plug-and-Stay nano receiver is so small you can plug it in and leave it in. You can also store the receiver in the battery compartment. PC/Mac-compatible mouse includes two AAA batteries. Batteries last six months.