I found trackers didn't work with my mum. I installed one her handbag and she had the child proof attachment undine in five mins and the device removed. I had a key ring tracker, that got removed as well or the keys just left behind. Its a tough one to deal with and the other flip side is once a person has wandered even with a trcaker on, you then have to be quick in responding and of course finding them -if the tracker worked or survived being removed.