Comes with a correct power supply for seamless operation.

To use this Kramer VP - 438 switcher, first connect it to the correct power supply that comes with it. Make sure all your analog and HDMI devices are properly plugged in. Then, you can easily switch between different sources for your presentations. When not in use, turn it off to save energy. For maintenance, keep it in a clean and dry place. Avoid exposing it to extreme temperatures or humidity. If there are any issues, check the connections first before seeking further help.