Using this Movek myMix personal monitor mixer is easy. First, since it doesn't have a power supply, connect it to a PoE source to power it up. When using, you can adjust the audio mix according to your needs. As for the slight scratches on the screen, they don't affect the normal use of the mixer. Just be gentle when operating the screen to avoid further damage. For maintenance, keep it in a dry and clean place. Regularly check the connection of the PoE cable to ensure stable power supply.