La Crosse Technology WS-9055TWC Instruction Manual page 4

In this time the indoor temperature
station and remote temperature sensor
will start to talk to each other and the
display will show both the indoor
temperature and an outdoor temperature.
If the indoor temperature station does
not display both temperatures after the
15 minutes please retry the set up as
stated above. After both indoor and
outdoor temperatures are displayed for
15 minutes you can place your remote
temperature sensor outdoors and set
your time.
The remote temperature sensor should
be placed in a dry, shaded area. The
remote temperature sensor has a range
of 80 feet. Any walls that the signal
will have to pass through will reduce
distance. An outdoor wall or window
can have up to 30 feet of resistance and
an interior wall can have up to 20 feet of
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