The device is used to power security camera with 12 VDC voltage over single coaxial cable and transmit/receive the composite HD video signals from the cameras over the same 75 ohm coaxial cable (RG-59 or higher quality) at a distance up to 1,200. Monitoring side input 24-36 VDC, plug and play. It is ideal for monitoring areas where no power is available to operate a camera.