Trackable bracelets

I've recently been aware of something called pfo. It's a technology that lets you trace a bracelet. It sounds like it's something taken from a spy movie or something. But I think that it's really cool. And it's really good to! You can track the members of you family to see where they are if something should happen. So if you think that something has happened all you need to do is look up the location online. I think that it's a really good thing for parents. I would feel much safer if my kids wore those.