Purex Technology 3000 DPI High Precision Wired Optical Gaming Mouse with adjustable Thumb-Rest - PXE-M720BU Adjustable 3000/2000/1500/1000 DPI hardware switch with LED indicating light, no software installation required. Color LED indicates DPI values, 1000 DPI (Green)-1500 DPI(Red)-2000 DPI(Blue)-3000 DPI( Purple) Ergonomic right-handed Design and 3-level adjustable Thumb Rest a prefect fit for different Palm Sizes Forward and Backward Buttons located on Thumb Rest for Easy Access Avago A3050 Optical Sensor supports maximun 20g Acceleration. 500 Hz Polling Rate.