Review on Trackimo Mini GPS Tracker - Portable Real Time Locator for Vehicles, Pets, and Children, Full Global Coverage with Android and iPhone App, Extended Battery Life. by Brian Kingsford

I bought this for my dog after trying a few others. This is better than most, but in general all of these products can be improved. This one will hold a charge for 3 to 4 days and will alert me when it gets low so that helps. However, the GPS isn't as accurate as we'd like and you can only set a rectangular geofence, which isn't great for our area as our yard isn't rectangular. Some products have more geofencing flexibility, but I haven't found any that last more than 24 hours. So this one is fine. The support also helped.