This Rolls PM55 personal monitor amplifier doesn't come with a power supply. There are some known issues: the power button is absent but can still be pressed, and the Ground Lift and Stereo Mono switches are missing.

Using this Rolls PM55 personal monitor amplifier? Since it doesn't have a power supply, you'll need to get one separately. When you press the area where the power button should be, it can still turn on the device. Be careful around the spots where the Ground Lift and Stereo Mono switches are supposed to be as they're missing. For maintenance, keep it in a dry and clean place. Don't expose it to extreme temperatures or humidity. If you notice any new problems, it might be time to check with a professional.