La Crosse Technology WIRELESS WEATHER STATION Instruction Manual page 7

3. After inserting the batteries into the transmitter, the Weather station will
start receiving data from the transmitter. The outdoor temperature/
humidity and the signal reception icon should then be displayed on the
Weather station. If this does not happen after 3 minutes, the batteries will
need to be removed from both units and reset from step 1.
4. In order to ensure sufficient 868 MHz transmission however, this should
under good conditions be a distance no more than 100 meters between
the final position of the Temperature Station and the transmitter (see notes
on "Positioning" and "868 MHz Reception").
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