'Basic hearing aid' presentation slideshows

Roger Pen Microphone - A Silver Lining for People With Hearing Issues

It is highly effective under two common circumstances u2013 first, when the speaker is speaking from a long distance like as in a presentation in an auditorium. And second when there is too much background noise during the speech like in a classroom lecture. https://us.morethanahearingaid.com/roger-pen/

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