Which technology, first widely adopted by major retailers around 2013-2014, allowed stores to anonymously track customer movements through their mobile signals without requiring app installation?

In the rapidly evolving world of retail analytics, companies continuously develop new technologies to better understand consumer behavior and optimize sales. One particular innovation revolutionized how retailers track customer movement and interaction with products in physical stores, leading to dramatic improvements in store layouts and inventory management. Test your knowledge about this game-changing retail analytics technology!

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Bluetooth Low Energy (BLE) Beacons
NFC Point-of-Sale Systems
RFID Customer Loyalty Cards
Infrared Ceiling Sensors