There is no limit, as long as the tag makes contact with any Samsung mobile phone in the vicinity

works poorly or not at all

These TAGS can interact with the registered device via BT (maximum 120 metres "according to SAMSUNG"). If the TAGS are further away, they connect via "FOREIGN DEVICES" and send the location.
It is planned that with Android 15 BT should always be on so that TAGS in general can be better located.