This SM Pro Audio PR8E preamplifier features eight channels but does not come with a power supply. Note that a power supply is not included.

To use this SM Pro Audio PR8E eight - channel microphone preamplifier, first, you'll need to connect your own compatible power supply as it's not included. Connect your microphones to the appropriate channels on the preamplifier. You can then adjust the gain and other settings according to your needs. When it comes to maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures or humidity. If there are any signs of damage or malfunction, have it checked by a professional.