2 ms·
Presumably using Bluetooth beacons. https://en.wikipedia.org/wiki/Bluetooth_low_energy_beacon https://en.wikipedia.org/wiki/Bluetooth_low_energy_beacon
by verify_sirrah 7y ago
Presumably using Bluetooth beacons.
https://en.wikipedia.org/wiki/Bluetooth_low_energy_beacon https://en.wikipedia.org/wiki/Bluetooth_low_energy_beacon