Ambidextrous design for comfort Resolution 400dpi PS2 port Win 9598MENT4.0 2000XPRunning speed 12 inch per second Long life time expectancy Enjoy smooth & precise performance with the Samsung Optical Scroll Mouse. The optical technology allows movement without a ball eliminating moving components & dust accumulation. The CMOS Sensor & DSP provides precise movement & the scroll wheel lets you scroll up & down without using the scrollbars through Windows & the Internet.