This Movek myMix personal monitor mixer is a great choice for audio enthusiasts. Note that it doesn't come with a power supply, but it can be powered via PoE. There are a couple of known issues: the cover of the main knob is missing, yet the knob still works fine. Also, the screen has some scratches on it.

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. Once it's on, you can use the main knob (even without its cover) to adjust the sound settings as you like. Be careful around the screen as it has scratches. To maintain it, keep it in a clean and dry place. Avoid exposing it to extreme temperatures or humidity. If you notice any further issues, contact the support team.