The ABT-204A is a 4-port USB KVM Switch with Audio and Microphone switching function. It also provides two USB 2.0 hub ports for high-speed USB 2.0 devices sharing. It allows you to control 4 USB-enabled multimedia computers and two USB 2.0 devices using only USB keyboard, mouse, monitor and a set of speakers and microphone. You can select the computers, USB device hub port control and audio/mic channel independently, using either front-panel buttons or keyboard hotkeys.