In a collaborative effort, Apple and Google have developed an industry-standard detection feature called “Detecting Unwanted Location Trackers” (DULT) for Bluetooth trackers. This standard allows users on iOS and Android devices to be alerted if an unknown Bluetooth tracker is monitoring their location.
It clearly says:
This is in general for carry-on and checked luggage. And then there’s the other paragraph about Lithium Ion batteries needing to go into the carry-on.