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A: Up to 4 Sensors at once, Up to 100 Beacons at once.
Q: where is the difference between Eventual and Periodic?
A: In Beacon list settings, configure Beacon Detection as "All" and Beacon Record as "Eventual". This will detect all surrounding Beacons and create Beacon records every 30 seconds.
Periodic mode creates an additional repeatable record (more than 30 s) - other / greater than the Update frquency
Thus, the Update Frequency settings where the minimum time is 30 seconds are important.