This RME ADI-648 MKII converter has undergone power testing and a factory reset. It comes with the correct power supply. There's a minor issue: the button on the output select is missing, but the internals work and can still be pushed.

Using the RME ADI-648 MKII is easy. First, connect it to the correct power supply that comes with it. When you start it up, it's already factory - reset, so it's like a fresh start. For the output selection, even though the button is missing, you can still push the internal part to make your selection. When using it, avoid exposing it to extreme temperatures or humidity. As for maintenance, keep it clean by gently dusting it with a soft cloth. If you notice any new problems, it's a good idea to contact a professional technician.