st johns medical alarms 5

https://yonderstack.com/s/TVgCVkXB_8tIzCFR1bFI5

I keep seeing these ads for St Johns medical alarms, and I wonder if they're worth it for my elderly mother. It's basically a pendant she can wear that lets her call for help if she falls or feels unwell. I appreciate that they monitor 24/7 and can send help right away, but I'm also curious about the monthly fees and contract terms. Anyone have experience with their service?