To use this AJA HD5DA 1x4 HD/SD - SDI distribution amplifier and repeater, you'll need to connect it to an external power supply as it doesn't come with one. First, connect your HD or SD - SDI sources to the input. Then, connect your devices that need the signal to the four outputs. When handling the device, make sure to avoid any static electricity that could damage it. For maintenance, keep it in a dry and cool place. Periodically check the connections to ensure they are secure. If you face any issues, check the connections first and then look for any visible signs of damage on the device.