Catherine.....
I had to get a medic alert for my mother before she passed because she kept falling ( she was 90) If she hit the button, the team on the other end of the line called her to make sure that she was alright. If they called her and she answered, she would tell them what was wrong. If she had fallen, the would call my cell, then my wife's cell, the the house, then the neighbor, then emergency personel if we didn't answer. There was a key hidden outside of her house that the life alert personel knew about and would tell the emergency personel the location if needed.
If the team called her and she didn't respond, they scrambled fire, police and emts!
Don't worry about not being heard by the team on the other end, the units are very sensitive and they could hear Mom from one end of her 14x70 mobile home to the other, even through closed doors!
Get one for yourself, Mom's was I think $24.00 per month and the thought of her being helped if we weren't able to get there to help her far exceeded the cost!
Good luck.
Dick