https://www.avextender.com/dual-head-kvm-extender/

Dual head KVM Extender from Beacon Links Inc. enables video transmission of two HDMIwith USB Keyboard/Mouse over a single Cat X cable in distance of 120 meters control. This reduces the complexity of an installation, saves cost, space, simple cabling. The Tx unit contains 2 HDMI and 2 USB ports for installation of either 1 PC dual HDMI, OR 2 PC single HDMI.

The product is based on Advanced Video Transport (AVT) Digital Communication technologies which signals connection all with isolated Transformer coupling.