Beacons

Beacons are inexpensive pieces of hardware that sit in physical locations like retail stores, stadiums, airports etc. They use a special version of Bluetooth, which is a low power, short distance communication protocol. All that beacons do is transmit data, meaning beacons do not collect any data from the devices that they send information to, and all interactions with that beacon are done by the device with reference to the information sent by the beacon. 

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