UPDATE:WOW! GREAT CUSTOMER SERVICE and THE DEVICE WORKS!!I received a call from a higher up about the difficulties I had with the Whistle Go Explore: she had seen my review, done some research, and had an answer to the issue (I will leave my original review so you will understand what I am referring to and if for some reason you have the same, you know why and how to fix it).The WiFi name at our home and one of them at our business are the same (who knew). When my husband took the device with him on the test run and it got within range of the business WiFi, the device saw the name and thought it was “home”, so it showed at “ home”. Crazy, huh! And when he left and the device was out of the WiFi range it did track again.So, all that said to tell you this device works!!If you have a strange thing happen, it could just be someone has a similar/the same WiFi name!Absolutely purchase this if you are concerned about knowing your pets location: it does work!After my dog went missing for almost 60 hours I set out to find a way to track him in the event he leaves again: I did a lot of research and based on the features, easy use app, and reviews, I purchased the Whistle Go Explore. I read all the literature and set-up was fast and easy. I put the device on my dog and it worked good while in his “safe” place and on WiFi, but once I tested the device and moved it outside “safe” it would not connect through cellular. I tried several times, contacted customer experience and after considerable effort on their part it was determined the device was defective.I repackaged it and sent it with my husband to return. When he left our home, the device connected and sent me a notification that my dog had left his safe area: I was excited! I thought the device just needed time to connect! I stopped tracking and told my husband to not send it back. When he left work to return home the device again notified me it was on the move; great! It was going to work!My husband kept the device in his vehicle when he returned to work (I wanted to be sure it was working correctly) and all the notices and tracking were spot on, he got to work (12 miles away) and parked. After about one minute the device kicked back and said my dog was at home and showed him Home on the app. I again called customer experience and described the new issue and was told it was a device issue and to go ahead and return it.After all this the battery still showed 12 days of use remaining, hence my 5 star battery life rating.I had already ordered a second replacement device so I got it charged, and set-up without issue. Again, I sent the device with my husband to verify the device working properly. Same song, second verse. Tracked fine all the way there, but after 30 seconds it kicked back to Home.If this is a device issue, I got two that were faulty.I am beyond disappointed. Back to the research.