The Serveredge KD 4UVH2 is a 4-port USB KVM switch with audio and microphone switching function. It also provides four USB 2. hub ports for high-speed USB 2. devices sharing. You can select the computers USB device hub port control and audio/mic channel independently using either front-panel buttons or keyboard hotkeys. This stylish Compact Desktop KVM Switch family is much more than an ordinary desktop KVM Switch. With Active Sync Replication (A.S.R.) KD 4UVH2 can fully support advanced DDC video signaling requirement of the latest operating systems such as Windows 7 and Mac OS X.