Nitpick: these are not "beacons", they are "sensors". The product page linked from the article doesn't even contain word "beacon". Beacons are unidirectional.

Nitpick: these are not "beacons", they are "sensors". The product page linked from the article doesn't even contain word "beacon". Beacons are unidirectional. But, beacons are hot right now, which presumably the author sought to capitalize on.