QHM 220 Usb Optical Mouse http://www.shopclues.com/qhm-220-usb-optical-mouse.html Description Interface: USB Optical sensor technology - 1,000 DPI optical sensor provides improved accuracy and precise mouse movements Dual-purpose design Large enough for comfortable desktop use Small enough for the mobile user Ergonomic Ergonomic shape provides support to help prevent palm strain Designed for left and right handed users Size: Small Technology: Optical
