Personal sound amplification devices already exist at significantly less cost than conventional hearing aids. https://jamanetwork.com/journals/jama/fullarticle/

Personal sound amplification devices already exist at significantly less cost than conventional hearing aids. https://jamanetwork.com/journals/jama/fullarticle/2635618 https://jamanetwork.com/journals/jama/fullarticle/2635618 https://www.nytimes.com/wirecutter/reviews/best-personal-sound-amplification-product/ https://www.nytimes.com/wirecutter/reviews/best-personal-sou...