What Is a Bluetooth Tracker? Before we dive into the actual product recommendations, you may be wondering what a Bluetooth tracker is and why you might need one. A Bluetooth tracker is a small device that you can attach to things that you don’t want to lose. They connect to your smartphone over Bluetooth and have other sensors so that you can see the location of the item on a map. You can think of Bluetooth trackers like “homing beacons” from sci-fi movies. Simply attach yours to something and you can track its whereabouts, assuming that you’re in Bluetooth range.