The TRO-1/400 is not an autonomous device. It must work with TRN-1/400 device.
The TRO-1/400 is designed to video signals transmission and power supplying via twisted-pair cable (UTP, FTP).
Both transmitter and receiver units adapt 75Ω coaxial cable impedance to twisted-pair cable impedance, what guarantees the video signal transmission up to 400m. The TRO-1/400 receiver supplies un-stabilized voltage (maximal up to 40V DC) to twisted-pair cable, and the TRN-1/400 transmitter converts it into 12V DC stabilized voltage, what enables power the cameras with thermostat.