This dbx 286A Microphone Preamp Processor comes with a correct power supply. It's a great option for audio enthusiasts. One small issue to note is that one of the knob caps is missing.

To use this dbx 286A Microphone Preamp Processor, first connect it to your microphone and the correct power supply. Then adjust the knobs to get the sound you want. Be careful when handling it since one of the knob caps is missing. For maintenance, keep it in a dry and clean place. Wipe it gently with a soft cloth if it gets dirty. Don't expose it to extreme temperatures or moisture.