https://en.wikipedia.org/wiki/Bluetooth_Low_Energy_beacon
National chains will have those scattered all over the shop so they can track where you walk and where you stop. Then they can provide custom specials for you.
https://en.wikipedia.org/wiki/Bluetooth_Low_Energy_beacon
National chains will have those scattered all over the shop so they can track where you walk and where you stop. Then they can provide custom specials for you.