I ordered it for my cat. The collar I use is my own, I just put the tracker on it. After paying the subscription, tracker fastly got online but didn't show the location. I put it on the window and after 30 minutes it got it. After that didn't have any problem at all. After turning it on , rapidly shows the location.
Important thing: the tracker can be turned off only via the app. Generally, I'm satisfied, I think I will give one to my friend who has a dog as he likes to walk it without a leash.