Bluetooth Low Energy - Wikipedia
https://en.wikipedia.org/wiki/Bluetooth_Low_Energy
Bluetooth Low Energy (Bluetooth LE, colloquially BLE, formerly marketed as Bluetooth Smart) is a wireless personal area network technology designed and marketed by the Bluetooth Special Interest...
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Bluetooth® Technology Website
https://www.bluetooth.com/
Responding to In-Person Teaching Challenges with BLE Real-Time Location Services. BLE Hard Tag Allows In-Store Shoppers to Buy Goods via Smartphone.