The Magic Message Audio-Visual Repeater

Can you figure out what this 1986 device was been used for? Tap on your screen and all will be revealed in this thrilling video.
BTW Post in the comments if you remember ever using one of these for real back in the day.

00:00 Start
02:32 Out of the box
09:26 Recording a message
10:10 Playing a message
10:26 Outside broadcast
11:25 Its intended use
12:02 Final thoughts
13:20 Patreon credits

FAQs
Q) What would the inside of the cassette look like
A) Just like this https://youtu.be/xU1aYAHmaJI?t=219

Q) You should have shown it working in a car?!?
A) This is what's happening at 11:25 - 12:02 (you can see the tell-tale steering wheel in the background at 11:42-11:52)

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---------- Outro Music -----------
Over Time - Vibe Tracks https://youtu.be/VSSswVZSgJw

------ Outro Sound Effect ------
ThatSFXGuy - https://youtu.be/5M3-ZV5-QDM

Regularly asked question
Q) Why are there comments from days ago when this video has just gone live today?
A) Patrons https://www.patreon.com/techmoan usually have early access to videos. I'll show the first version of a video on Patreon and often the feedback I get results in a video going through further revisions to improve it. e.g. Fix audio issues, clarify points, add extra footage or cut extraneous things out. The video that goes live on youtube is the final version.