BLE (Bluetooth Low Energy) beacon

A device that broadcasts a signal that can be identified by other BLE devices in its vicinity. An iBeacon is Apple’s version of the BLE beacon service. Smartphone apps listen for the signal and when the desired conditions are met, they will send a notification to be displayed on the smartphone or trigger an event within an app, which could be an offer, information or other content relevant to the location. Beacons can be deployed individually or as a network.