This unit doesn't come with a power supply. There's a known issue where the output fade knob cover is missing, but don't worry, the knob still works just fine.

To use this Roland V - 1HD portable video switcher, first connect your devices to the 4 HDMI inputs. Remember, you'll need to use your own power supply since it's not included. When using the output fade knob, even though the cover is missing, it will still function properly. As for maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures. If you notice any other problems, contact the support team for help.