This Crown Com-Tech 400 2-Channel Power Amplifier comes with a correct power supply. A minor issue: the plastic on the front of the amp is slightly peeling off, but it still works perfectly fine.

Using this power amplifier is easy. First, make sure you connect it to the correct power supply as included. Then you can connect your audio devices to start enjoying high - quality sound. When using it, avoid placing it in a humid or dusty environment. For maintenance, keep it clean by gently wiping the surface with a dry cloth from time to time. Even though the plastic on the front is slightly peeling, it doesn't affect the performance, but try not to touch it too roughly to prevent further peeling.