Using the Movek myMix Personal Monitor Mixer is easy. First, since it doesn't have a power - supply, connect it to a PoE source to get it up and running. When you're using the main knob, even though the cover is missing, it should still work fine for adjusting settings. Be aware that the screen has scratches, so it might be a bit less clear, but it won't affect the functionality. Also, keep in mind that the unit can be noisy. For maintenance, keep it in a clean and dry place. Wipe the surface gently with a soft cloth to avoid causing more scratches on the screen. Don't expose it to extreme temperatures or moisture as this could worsen the existing issues or cause new problems.