Bluetooth Low Energy (BLE)
Bluetooth Low Energy is a radio-frequency (RF) technology for wireless communication that can be leveraged to detect and track the location of people (ex: Enlighted Inc).
https://www.inpixon.com/technology/standards/bluetooth-low-energy
Bluetooth vs Bluetooth Low Energy
Bluetooth can handle a lot of data but quickly consumes battery life and costs a lot more. Bluetooth Low Energy is used for applications that do not need to exchange large amounts of data and can run on battery power for years at a cheaper cost.