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This power supply has a "B" mark on its casing. Inside there is a protective fuse for overcurrents. LED on the top is to signalize that the unit is working. It does not have an ON/OFF switch. The adapter supplies power to units installed in antenna power boxes directly over a wire. It comes with a separator that allows to feed power over the same cable that video/audio signal is transmitted from amplifiers to receivers.

The way one have to prepare and connect coax cable do the power separator