This is the receiver half of an ATEN 4K HDMI KVM-over-IP extender kit — it takes a KVM (keyboard/video/mouse) and HDMI video signal that's been sent over a standard IP network from a matching transmitter unit (see the paired listing, MAR-0005684) and outputs it locally at the remote workstation, supporting 4K video resolution. Extenders like this put a full desktop experience — screen, keyboard and mouse — at a distance from the actual computer, over existing network infrastructure rather than a dedicated point-to-point cable run, common in control rooms, broadcast setups and secure environments where the PC itself needs to stay in a separate server room. A transmitter unit and supporting network infrastructure are required alongside this receiver for a working setup.