A 120m KVM Extender is a professional AV/IT device that transmits high-definition video (up to 4K or 1080p) and keyboard/mouse (USB) signals up to 120 meters (394 feet) over a single CAT5e/CAT6/CAT7 Ethernet cable. It consists of a transmitter (sender) and receiver, allowing remote control of computers or NVRs in security, corporate, and industrial settings.