Ok, at first I thought other than using Bluetooth (BLE), Aruba can also use WiFi to track.
So since we still have older APs (1xx, 2xx series) then we need to buy the beacons then. The 2xx series seem to have USB port we can power up beacons but the 1xx series doesn't so we have to buy a battery powered beacons for them.
Am I getting all this right?