A knock off smart ring is $50 on Amazon with no subscription. Personal security starts at $200k a year. You may want to investigate how much what you think of as luxury costs.

I wrote my post an hour ago, immediately edited it 1 minute after to put the following in "on edit: note this is my idea of what smart rings should do, don't know what the normal ones do, so my idea that it should be a luxury item may not track actual situation"

you posted yours 44 minutes ago.