A bluetooth Beacon is a wireless device that constantly emits a radio signal that can be seen by other devices. Such a beacon has many interesting uses like in large warehouses products emit their unique identifier signal that robots then receive and use it to pick specific items. Or, beacons can be used for tracking animals to find out their migration paths. Microbit has a low energy bluetooth antenna that can be used to make one Microbit a beacon and other microbits can receive the signal. You can attach this to your keys and next time you lose them you can find them using a radio signal! In this video, we will learn how to use microbits like beacons.