Here is a GPS tracker that lets you keep an eye on your loved ones or important belongings anywhere within a range of a cellular network. The Samsung SmartThings LTE GPS Tracker is water resistant (IP68 certified). It can be set up to notify you when it arrives or departs a preset zone.
Since this tracker is LTE-based, you get a much better range. The battery lasts up to 10 days. SOS functionality is also built-in.