Kensington 72127 PilotMouse Optical 3-Button USB/PS2 Mouse (PC/Mac) DiamondEye optical technology responds to your fastest movements with accurate tracking and precise guidance Provides the convenience of two mouse buttons, with a third button and scroll wheel combo 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 Unique, ergonomically-designed shape is comfortable for both right- and left-handed users