Excellent, useful device. Had one for well over a year now and can highly recommend it. The chances of finding your cat with this collar are so much higher than without it. The battery life, low radiation, GPS and radio tracking set this apart from other options. Some things missing to make it perfect: the most notable missing thing is an option to have the collar beep, this would make tracking far, far more effective. Lower profile collar would be better too, without the big bump. An auto alert if the cat goes a certain distance away would be useful too. If those could be implemented this would be the perfect product. Without those it's still a very good product and I can thoroughly recommend it. 4.5/5