It helps if the person depending on it is mentally alert. I had a 90 year old neighbor who had some kind of "first alert" system. I think she wore it around her neck. One day she fell down in her house and couldn't get up. She was on the floor for several hours until her daughter came over to check on her. When her daughter asked why she didn't press the button for help, she said she forgot that she had it. Luckily, she wasn't hurt.
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