HP F4815A 3-Button USB Optical Scroll Travel Mouse HP F4815A 3-Button USB Optical Scroll Travel Mouse General Features: 3-Button design Scroll wheel acts as third button USB interface Optical sensor provides superior performance Includes 3 color jackets to personalize your mouse Travel size, easily fits in your carrying case For notebooks and desktop PCs 3-foot cable length, approximate Unit Dimensions: 3.5 x 2 x 1.25-inches (H x W x D, approximate)