La Crosse Technology WIRELESS WEATHER STATION Instruction Manual page 9

4. The outdoor temperature and humidity from the first transmitter (channel 1)
should then be displayed on the Temperature station. Also, the signal
reception icon will be displayed. If this does not happen after 2 minutes, the
batteries will need to be removed from both units and reset from step 1.
5. Insert the batteries to the second transmitter immediate after (in 10
seconds after) inserting battery to the weather station.
6. The outdoor temperature and humidity 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.
51