I’d like to quote them from their tumblr blog:
“Businesses can rely on it to get hyper accurate information about who is in their store RIGHT NOW.”
Exactly like they say!
THERE IS NEED TO INTERACT WITH REAL PEOPLE, ACTUALLY STATIONING IN THE STORE, WHEN THEY ARE IN.
I think the right answer is in using no-internet technology. I know sounds old fashioned, but often the technology from the past are the revolution of the future.
Here you can find more ideas about no-internet: