This AJA HD5DA device doesn't come with a power supply. It's a great choice for signal distribution.

To use this AJA HD5DA distribution amplifier/repeater, first connect your HD/SD - SDI source to the input. Then connect up to four devices to the outputs. Since it doesn't have a power supply, you'll need to use your own suitable one. When handling, be careful not to drop it as it may damage the internal components. Keep it in a dry and cool place. Regularly check the connections to make sure they are secure. If you notice any issues, check the connections and your external power supply first.