This unit doesn't come with a Network Module. It includes a proper power supply. There's a minor issue: three screws on the side of the enclosure have broken off, but the stem is in the screw holes. You can still easily and safely remove the top chassis enclosure.

Using this Klark Teknik DN9650 Digital Audio Network Bridge is straightforward. First, connect it to a power source using the included correct power supply. When you want to access the inside, don't worry about the three broken screws on the side; you can still remove the top chassis enclosure easily. Just be gentle. As for maintenance, keep it in a dry and clean place. If you need to move it, handle it carefully to avoid further damage to the enclosure. And remember, since it doesn't have a Network Module, you'll need to provide your own if required.