From the "Just because I'm paranoid doesn't mean they're not out to get me!"
department, I could probably think of several surreptitious uses for the Stick-N-Find device. Here's one from the Stick-N-Find website, itself:
You could also stick the Stick-N-Find on your wife’s car.
Once she pulls in the driveway, you get a notification, clean
up your mess, and go wash dishes before she comes in.
Don't forget to hide your mistress!
If you happen to have a stalker, ask an ally to secretly adhere a Stick-N-Find to her purse, pocket or bag and receive a warning if she comes within 100 feet of you, although changing out the battery yearly may be problematic.
There may be other surreptitious uses.