Wireless mouse JD-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.