A Beacon is a radio signal. Set up Beacons in a designated area, when a user comes close to one of them, he will receive a notification.
How to Use Beacons — Three Steps
Step 1. Buy your Beacons at a manufacturer (for instance Kontakt, Radius or Estimote). Step 2. Register them in your back office and assign message sending behaviors to them. Step 3. Once your Beacons are configured, set them up in your shop.
Define what notifications users will get when passing by a beacon. There are many targeting attributes. They allow you to send out relevant messages.