IOGear GCS1804 4 Port KVMP Switch with 2.1 Audio is a 4-port KVMP switch with stereo audio ports and an integrated 2-port USB 2.0 hub. Now, users can control up to four computers and share two additional USB peripherals from a single keyboard, monitor, and mouse console. It features the patented asynchronous switching, which allows the user to independently switch applications between the connected computers. You can run an application on one computer while running another application on the other. Moreover, the integrated 2-port USB 2.0 hub is available for each computer to share multiple peripherals connected directly to the hub or via daisy chaining external powered USB 2.0 hubs. Access to such peripherals is performed on a one-at-a-time basis. Additionally, the display emulation technology makes the switch intelligent to read and remember the monitor optimal display parameters and refresh rate. The audio ports allow for connecting powered PC speakers for stereo sound and a single microphone for audio input/output to each computer.