-9028----Resolution: 800DPI-----Super performance & high reliability with power saving function.-----Compact size for both comfort and portability.------Auto sleep function design.-----Bulid-in charging function inside the mouse .-----USB receiver and plug& play. ----2.4G wireless transmission technology , Can be used 360 degree free in area of 10-meter radius. shorten the time between transmission to receiving .-----The intimate LED indicator light shows the state of power momentarily ,save your worry ,It can be used under any kind of circumstances ,except the glass interface.---- Compatible with Microsoft WINDOWS XP & OFFICE XP.-----Quality guarantee CE & FCC certificate.ng .