Technoline WS 9750 Manuel D'utilisation page 57

Note: User shall insert the batteries into the second transmitter within 10 seconds of
reception of the first transmitter.
6. The outdoor temperature from the second transmitter and the "channel 2" icon
should then be displayed on the Temperature station. If this does not happen
after 2 minute, the batteries will need to be removed from all the units and reset
from step 1.
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.
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