Kensington 72227 Optical Wireless USB/PS2 Mouse (PC/Mac) DiamondEye optical technology responds to your fastest movements with accurate tracking and precise guidance Quick RF wireless technology prevents annoying cursor hesitation to provide ultra-smooth movement and precise control Connects via USB/PS2 and is guaranteed to work right out of the box on both PCs and Macs Backed by a five-year manufacturer's warranty and free technical support Three buttons and a scroll wheel, in a compact shape that is comfortable for both right- and left-handed use