La Crosse Technology WS-9121 - Manual (Page 10)

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and reset from step 1.
5. Insert the batteries to the second transmitter as soon as the
outdoor temperature readings from the first transmitter are
displayed on the temperature station.
Note: User shall insert the batteries into the second transmitter within 45
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.