Comes with the right power supply for seamless operation.

Using your Crest Audio CA4 2 - Channel Power Amplifier is easy. First, connect it to the right power supply that comes with it. Make sure the power is off when you're making the connections. Once connected, turn on the power. You can then connect your audio sources to the amplifier. When you're done using it, turn off the power to save energy. Keep the amplifier in a cool, dry place to avoid damage. If it gets dirty, use a soft, dry cloth to clean it. Don't use any harsh chemicals as they might damage the amplifier.