HP USB Optical Scroll Mouse

Optical tracking - Reduce sticking and constant cleaning with optical tracking - a system that works through light with less moving parts for greater durability than ball-based mice. The optical sensor within the HP USB Optical Scroll Mouse employs a scan rate of 800dpi and enables crisp motion without a mouse pad, ball or roller. The optical sensor within the HP USB Optical Scroll Mouse employs a scan rate of 800dpi