The rig was full of Edison plugs (120 volt) but no place to stick a DC device, which can be a pinch if you’re operating on battery power. Now we’ve got 12VDC and USB jacks beside each bed and a central unit with voltage readout under the dinette. Had to put a dot of black paint over the blue LED’s to With our 12VDC fans, adapters and appliances, we’re ready to plug and play!