Beacons can help your business. They are wireless broadcasting devices that send signals to smartphones belonging to customers who come into your store. Once connected, you can deliver messages to smartphones as they enter your retail store. Within the next three years, there will be nearly five million beacons in the U.S. in brick-and-mortar stores. Beacons work through a Bluetooth signal to notify an app to send targeted specials meant to entice your customers to buy more items during their shopping visits.