This is used KVM Switch that includes audio & USB (for keyboard and mouse) along with VGA display switching.

Typical use is you can use 2 computers with a single monitor and switch your display between them (includes audio switching), while still just using 1 keyboard and mouse.

It has always been fully functional and seems to be very reliable (I have had one other brand fail before I bought this one).

I've adjusted my workstation and since I no longer have any use for this and I do not want this back for any reason whatsoever, I am selling this "AS/IS".  No Returns, No Exchanges, No Refunds!