Kensington Studio Wireless Optical Mouse (64337) RF Technology - Requires no line of sight. Operate the StudioMouse Wireless anywhere within a 6 foot radius of your computer DiamondEye Optical Technology - Allows you to work on nearly any surface with precision & accuracy Unique Scroll Sensor - Improves your scrolling ability by speeding up or down the page by pressing & holding the sensor MouseWorks Software Included - Program buttons Requirements - Windows 98, Me, 2000, or XP / Mac OS 8.1 or later