* Enhanced precision with optical engine, eliminates moving parts and dust accumulation. * Fast scrolling wheels for simple scroll and zoom function under window applications and web navigation *System requirements:DOS5.0/WIN95/98/NT/ ME/2000/XP * Interface:PS2 * Resolution:520 DPI * Switch life:million times * Working voltage:+5V¡À0.5V * Working current:60mA * Sleep current:10mA *Product size:115*60*36mm