La Crosse Technology WIRELESS WEATHER STATION Instruction Manual page 8

When more than one transmitter is used
1. User shall remove all the batteries from the temperature station and
transmitters and wait 60 seconds if setting has been done with one
transmitter before.
2. Insert the batteries to the first transmitter.
3. Within 30 seconds of powering up the first transmitter, insert the batteries to
the Weather Station. Once the batteries are in place, all segments of the
LCD will light up briefly. Following time as 0:00 and the "weather man" icon
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.
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