There were portable radios:
From the website, in spanish:
La historia de la radio en uruguay
Also, the people has commented that hearing aid devices were huge ear trumpets, not so:
http://www.hearingaidmuseum.com/gallery/Carbon/Acousticon/index-acousticon.htm
The "Time traveller" lady could just be singing along the tune heard from a music box:
Here is the original video:
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