This AJA HD5DA 1x4 HD/SD - SDI distribution amplifier and repeater is a great choice for video signal management. Note that it does not come with a power supply. What's included? Well, just the amplifier and repeater itself without a power supply.

Using this AJA HD5DA 1x4 HD/SD - SDI distribution amplifier and repeater is easy. First, connect your video source to the input port. Then, connect your displays or other devices to the output ports. Since it doesn't have a power supply, you'll need to use your own suitable power supply. When using it, make sure the power supply you choose has the correct voltage and current to avoid damaging the device. As for maintenance, keep it in a dry and clean place. Regularly check the connections to make sure they are secure. If you notice any issues with the video signal, check the connections first. If the problem persists, it might be a good idea to consult a professional.