I cannot recommend the PetTracer product and their customer service enough. Long story short, we found our blind, 13 month old kitty, Mei, hiding in the engine of a car about half a mile away due to the PetTracer collar having been missing for over 12 hours. I genuinely think she'd have been lost forever without it. Not only that, Anna, from PetTracer, who was helping us with settings remotely as we searched for Mei, was compassionate, helpful and engaged throughout the entire day we were searching for her. Mei's collar wasn't picking up satellites as (unbeknownst to us at the time) she was surrounded by engine block but we took the home station out and used it as a mobile unit and it gave us enough of a radio signal (finally!) to locate her. We live in the countryside and there's a lot of space to search hence the time it took to locate her. The location isn't alway 100% accurate, as some people have said, BUT we know where to start looking for them if they don't come home. The collars are also bulky (although light) for small cats but our don't even seem to notice they're wearing them. Perhaps the collars wouldn't work so well in a very built up area but for me, in the middle of nowhere, they're great.