listen for massages

I have 'old' original Delorme Explorer.

I can operate it with tracking OFF.

I can set an interval of listening for mew messages to let say 10min

On the display of the check messages icon it says listening for new messages, next listen 12.23 and there is down counter running and saying how many min it takes to next listen.

The device is outside, I have sent message to it (from portal) but after hours it still does not receive anything.

If I go to to push the check now, I will receive the message.

What exactly I have to set up with the listen for messages to actually also receive a message when no active mail check and no tracking is going on?

Does this listen have any function at all?

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