Just saw in the latest AARP bulletin an ad for MobileHelpNow.com. A pendant button around the neck (can also shower with it); works about 500 feet outside, from the base unit. 24/7 live people to answer; no contract to sign; I believe it said $36.95 per month. You can log onto your account and see where he/she is if they are within the range. Check it out if interested in something like this. I'm going to explore it more. DH can't use the cellphone or regular phone, but he can push a button, and if he is missing but close to home, I could see where he is.

i think that is something that would be worthwhile to check out. even those who have no dementia but live alone