TFA 30.3029 Manual Del Usuario página 114

under good conditions be a distance no more than 100 meters between the
final position of the Temperature Station and the transmitter (see notes on
"Positioning" and "868 MHz Reception").
When more than one transmitter is to be used
1. User shall remove all the batteries from the temperature station and
transmitters and wait 60 seconds if setting has been done with one
transmitter before.
2. Insert the batteries to the first transmitter.
3. Within 30 seconds of powering up the first transmitter, insert the batteries to
the Temperature Station. Once the batteries are in place, all segments of the
LCD will light up briefly. Following the indoor temperature and the time as
0:00 will be displayed. If they are not shown in LCD after 60 seconds, remove
the batteries and wait for at least 60 seconds before reinserting them.
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