La Crosse Technology WS-9121 - Manual (Page 9)

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2. Insert the batteries to the first transmitter.
3. Within 2 minutes 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.
4. The outdoor temperature 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