We had 6 cats. Within a 6 month period this year, 2 have gone missing, most likely due to predators. We now have 4 cats. Our 2 older cats rarely leave the yard, but our 2 younger ones love to explore so we got them the TabCat trackers so that we can have peace of mind. We now keep everyone inside at night so before we go to bed, if they aren't already in the house, we go out looking for them. I'm happy just to get a low signal on them, at least that way I know they are near. Sometimes Scooter goes a couple of blocks down and the tracker won't pick her up, but I know that if I walk down the street, it will. We are much more relaxed now that they have these trackers.