This Movek myMix personal monitor mixer is a great option, though it doesn't come with a power supply. But here's the good news - it can be powered via PoE! Please note, there are some scratches on the screen.

Using this Movek myMix personal monitor mixer is easy. First, since it doesn't have a power supply, connect it to a PoE - enabled source to power it up. Once it's powered, you can start adjusting the audio settings according to your needs. Be careful when handling the mixer because the screen has scratches, so try not to add more damage. For maintenance, keep it in a clean and dry place. Regularly check the connections to make sure they're secure. If you notice any performance issues, check the PoE connection first.