Wireless Optical Mouse: The Wireless Optical, is a cordless optical 5 button wheel mouse that includes an advanced high precision 2X, 800 dpi optical sensor, and provides low power consumption, better than any previous optical mouse. In addition, the RF Digital Radio technology gives you the best flexibility to let you work where/how you want without a mouse pad and you never have to clean the mouse. Plus, it has 256 ID codes to reduce potential interference between other devices.