UDPATE: So, we've had the WhistleGoExplore for about 4 months now, and it has been having connectivity issues. I thought it was the AT&T network near us, but it turns out it isn't. We adopted a second dog, and ordered another WhistleGoExplore. This one works so much better. We walk the dogs together, and the newer device tracks well but the original one doesn’t track much at all. We took a 4-hour road trip yesterday, and the new WhistleGoExplore tracked everything, while the WhistleGoExplore for our other dog didn't track a single location point on our drive and subsequent stops. One dog was tracked all day, while the other barely registered leaving the house. I called customer service, and they gave me the run-around. They say they see the issue, but think it is just the network. Clearly that isn't the case, as the dogs both have the Whistle Collars and the same devices and are walked together, but only 1 is tracking location accurately and consistently. They have refused to replace the defective device. Bad customer service. Inconsistent devices. If I could do it all over again, I would either try a competitor (Fi) or wait until Whistle develops a better/more consistent product, or improves their customer service. I wholeheartedly warn you against buying this product. I'm returning the one we just got and trying to get out of my subscription for the first one we bought.ORIGINAL REVIEWI purchased the Whistle Go Explore for the sole purpose of being able to track my dog should he get out of the house. The pet health features are fine, but that is not why I purchased it. I'm sure if at some point the device alerts me that my dog is licking or scratching more than usual, it will be helpful, but my intent of purchasing the product and my review will focus on the GPS location feature.I did a lot of research before purchasing the Whistle Go Explore, and I was a little torn between the Whistle and some of the competitor devices. I've had the Whistle Go Explore for about 3 weeks, and it seems to be working well, and I'm happy with my purchase. Overall, I would recommend the product. There is more detail for the cons listed below than for the pros, but that is just because I want you to be aware of what you're getting. Here is what I like and don't like about the Whistle Go Explore. . . .Pros - - seems to be one of the best on the market for quickly identifying that you're dog is no longer in the safe zone - the device and collar (I purchased the Twist and Go collar) seem to be heavy-duty and well-made - the device seems to be pretty accurate. When I track my dog outside the house, it has been pretty accurate. - the battery life has been good. I got over 2 weeks with the initial charge, and the app alerts you when the battery gets low. - the device is relatively small and unobtrusive - the device is waterproof, as described. My dog has been swimming twice and the device continues to work. - Although I don't care about the Health tracker, it has been motivating to hit the "goal" exercise level every dayCons - - Location tracking is Real Time, but ONLY after the system realizes that your dog is out of the safe zone. You can't force the device to go into tracking mode until after the system has pinged your dog's Whistle outside the safe zone (which defaults to every 6 minutes). When going on walks, the system doesn't generally realize my dog has left the house until I'm 2 blocks away. So, that same thing applies if he were to get out and go wandering. Lets say your dog gets out of the house and you're trying to track him/her. The system won't let you track him/her until the system hits the 6-minute check-in and realizes that your dog has left the safe zone. So, if you realize the dog is gone before the system does, you can't track the dog until the system catches-up. There should be a way to force the system into tracking mode. I had an issue once (pre-Whistle) where my dog was under the deck, and I couldn't find him. In similar situations, it would have been nice to be able to force tracking so I was sure he was in the safe zone, and not that he wandered but the system hadn't recognized it yet. I did just speak with a customer rep, and she showed me how to reduce the interval from 6 minutes to 3 minutes. That is better, but it still won't allow me to force tracking mode and it uses more battery life. - The safe zone is larger than I would like. Even though I set a narrow safe zone, my dog's Whistle connects to my home network at the end of my block (2 houses away) to let me know that he is home. I'd rather the perceived safe zone not encompass my whole block.- There seems to be no set policy on cancelling the subscription service. I wanted to buy the 3-year plan because it is cheaper on a monthly basis, but Whistle would not commit to providing a prorated refunded for months not utilized should my dog or the device die. That seems ridiculous. I asked several times, and was told that it is decided on a case-by-case basis. So, if your device stops working at 2 years . . . . you're out of warranty, the device doesn't work, but you're still on the hook for the last year of service. I know this is morbid, but the same thing applies should your dog die before the subscription completes. Talk about salt in a wound. Super bad customer service here.- For some reason, the devices are cheaper on Walmart.com and Amazon.com, than they are on the Whistle website. Seems silly, and logical to just buy through Amazon. The reason that this is an issue, though, is the 90-day refund guarantee. Whistle says that if you're not satisfied with the device, you can return it within 90-days for a full refund. However, your unused subscription will only be refunded to you if you purchase the Whistle through their website. There is no guarantee of a subscription refund if you buy through Amazon or Walmart. And Whistle will not price match Walmart or Amazon (which is super weird since its all their product).- I bought the Twist and Go collar offered that is compatible with the device. I like the collar, and I recommend it. The kit comes with a Hook and Loop attachment for wider collars and a snap attachment for narrower collars. The Snap attachment looks OK, but I would not use the Hook and Loop attachment. It uses velcro, and the velcro isn't long enough to securely hold the attachment in place on a wider collar (See Attached Pics).- Lastly, this wasn't an issue for me, but you should know that the package comes with a microUSB charger cable, but no power adapter. You may be fine with that if you have USB outlets or a bunch of power adapter boxes around your house from other electronics and phones.If you have issues or questions for Whistle, I recommend calling them instead of using the Chat feature. I've had very bad luck actually being able to connect to a live person via Chat on the Whistle web site.So, overall, I like the Whistle Go Explore, and I recommend it. There are some draw-backs, though. Whistle could easily rectify these, and hopefully they will in the future. Their customer service isn't great, but the product seems to be solid.