Wish I had bought a product like this before my dog got lost for 3 days in the woods!What I liked about the product:Battery life: GO Explore has the longest battery life I have found on the market. I am satisfied with the battery life of the Whistle. The Whistle needs to be connected to WiFi for the majority of time to achieve the suggested battery life. It is much shorter when on GPS only - I have found it to last just over a day, but I expect that I would find my dog before then. It allows me to keep the tracker on my dog except for a short charging time once a week.Waterproof: My dogs are swimmers. It needed to be able to get wet and still work. Both of my dogs have swum and jumped into murky bay water multiple times and have not had an issue with the Whistle working.App: I have an Android, and the app works great. I can add others as owners. The app alerts all owners when my dog leave a safe area (the house and yard) and gives estimated distance away from the house.GPS Updating: Through the app, you change how often the device updates when it is outside of the safe zone. You or other owners can also start a tracking session which updates much more frequent.Night light: This was an extra feature that I was not looking for in a tracker. During the day doesn't make any difference, it seems like a bright light at night, but haven't tested this feature much.Wellness Reports: They send this report through e-mail. It gives information about activity level, sleep, scratching, and licking. I would like it if they made it available in the app.Support: My second tracker, never worked correctly. It wouldn't sync with the app except to say the battery is fully charged. I was able to return/exchange quickly for a new one. I talked to their support but exchanged through .What I disliked about the productMonthly fee: Needed to activate and use the tracker. Roughly $8/month if you pay for the year up front for peace of mind you know where your dog is.Needs WiFi for the extended battery life. If dogs are staying away from home for an extended time without WiFi, expect to be charging the device daily.