I had Life Alert for a couple of years. Excellent service, but very pricey.

They have a pendant that you wear around your neck. It is waterproof, so you can even take it in the shower.

Expensive though.

I had it about 8 years ago. Back then, it was $70 per month.

And you don't have to just use it for medical emergencies. It can be used to contact the police or fire departments.

There might be other emergency alert devices that are cheaper and do some good things also.

AARP has a bunch of articles on Seniors and safety.

Here's one:
https://www.aarp.org/home-family/your-home/info-2021/aging-in-place-checklist.html