if it's a hearing amplifier, then who is she listening too? I don't see anyone next to her and the guy who is walking in front of her is several paces in front

if it's a hearing amplifier, then who is she listening too? I don't see anyone next to her and the guy who is walking in front of her is several paces in front. I would think that if my friend had a hearing issue, that I would closer to them and sort of make sure they could hear me. Then the woman stops and looks around, lips moving, and no one near her. I'm not buying into the time travel crap but does look strange and the hearing aid also appears doubtful too. I had thought it might be a 2 way radio but from what I read, 2 way radios didn't come about until 1928 and they were very large boxes of electronics (tube electronics).