Question

One new technology being adopted by retailers is​ __________. for​ example, when​ opted-in customers enter a​ store, a signal wakes up an app on their smartphone or​ tablet, which welcomes them and alerts them to​ location-specific rewards and personalized product recommendations within the store.

Answer 1

the answer to this question is beacon technology
beacon technology able to achieve this by transmitting a small amount of data via bluetooth.
In the beginning of its development, the technologies that created with beacon could only be used indoor but now many adjustmnets had been made so it could also be used outdoors.