TFA 30.3029 Manual Del Usuario página 116

7. Insert the batteries to the third transmitter as soon as the "channel 2" icon
and outdoor data are displayed on the temperature station. Then within 2
minutes, the channel 3 outdoor data from the third transmitter will be
displayed and the channel icon will shift back to "1" once the third transmitter
is successfully received. If this is not happen, user shall restart the setting up
from step 1.
Note: User shall insert the batteries into the third transmitter within 10 seconds of
reception of the second transmitter.
8. In order to ensure sufficient 868 MHz transmission however, this
should 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").
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