This Lab Gruppen power amplifier comes with a 20A Edison plug. However, note that the output cover on the back is bent.

To use this Lab Gruppen power amplifier, first connect it to a power source using the 20A Edison plug. Then, connect your audio devices to the appropriate channels. When using, make sure the environment is well - ventilated to avoid overheating. Since the output cover on the back is bent, be careful not to apply extra pressure on it. For maintenance, keep it clean and free from dust. You can use a soft, dry cloth to wipe it regularly. If you notice any abnormal performance, stop using it immediately and seek professional help.