John Connor (Christian Bale) uses this tape player/recorder to continuously seek inspiration and advice on her mother's recordings allegedly taken place during the first film of the saga. We can see John several times in the movie listening to the recordings on this mid-sized tape recorder which looks dirty and weathered by production.
This is the only tape recorder dressed and used for the movie, one of a kind, easy to screen match thanks to the dirt and weathering applied to it. It comes with a (sadly) empty 60min tape labeled 5/3/84 placing the recordings (added in post-production with Sarah's voice) right after the events taken place during the first movie.
Even if not needed, item came with COA from the great Phil Steinschneider.