This Behringer Europower PMP550M powered mixer comes with the correct power supply. It has a very minor hiss, but you won't notice it when playing a signal. It's a great choice for audio mixing needs.

Using this Behringer Europower PMP550M mixer is easy. First, connect the correct power supply that comes with it. Then, plug in your audio sources to the different channels. You can adjust the volume and other settings according to your needs. When it comes to the hiss, don't worry about it as it won't be heard when you play a signal. As for maintenance, keep it in a dry and clean place. Don't expose it to extreme temperatures. Regularly check the connections to make sure they are secure. That way, your mixer will work well for a long time.