This just in from a radio collectors estate .   the item is marked Muzak IB-1 in corner.  almost reminds me of a kit project.   Untested .  I opened it and did find some very old National Panasonic Batteries inside, so you know it is old.  use zoom, batteries look shot.    Now with this, was a one sheet , Muzak model A-12...   so not the same model as on the unit.  ... so not sure if one has anything to go with the other?  but schematic is included......   nothing else included.   written in pencil is  9.6 VDC....  so must need a power adapter /charger...?  case in good shape... being sold as-is, as found, final sale.  not sure what this device does...   hopefully you do.      thank you.

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