The Passive Video Balun Transceiver with Screw-Type BNC Connector for CAT5 UTP, 1 Channel - UTP-202A is a device that allows you to transmit video signals over a CAT5 UTP cable. This is useful for CCTV applications where you need to transmit video signals over long distances without the need for an amplifier. The balun is passive, so it does not require any power. It simply converts the video signal from the BNC connector to a signal that can be transmitted over the CAT5 UTP cable.