Kensington 72237 PocketMouse Optical Wireless Micro Travel Mouse (PC/Mac) DiamondEye optical technology responds to your fastest movements with accurate tracking and precise guidance on virtually any surface RF receiver fits inside the chassis so it never gets lost, and automatically turns the mouse off when stored to extend battery life Works right out of the box on both PCs and Macs with an open USB port Backed by a one-year manufacturer's warranty Two programmable mouse buttons simplify repetitive tasks, and a scroll wheel makes navigation easy