Belkin gives you control over four computers - either PS/2 or USB models, or both - from a single PS/2 console. Belkin's audio feature lets you switch between computers sharing speakers and a microphone, without having to unplug and re-plug them. Using the SOHO Series on Sun and Macintosh USB platforms gives you easy, cross-platform control. With its advanced features, such as audio and microphone switching support, the Belkin SOHO Series makes controlling multiple computers easier than ever. PRODUCT FEATURES: Controls 4 computers from 1 keyboard, video monitor, and mouse; Offers audio and microphone switching; Features PS/2 hot keys and direct-access port selectors for easy manual switching; Delivers uncompromising display quality; Updates firmware easily with flash feature; Build-in cable management with sleek vertical design; Requires no additional power supply.