La Crosse Technology WS-7208TWC Instruction Manual page 5

Your distance plus resistance should not
exceed 80 ft. in a straight line.
NOTE: Fog and mist will not harm
your remote temperature sensor but
direct rain must be avoided.
To complete the set up of your indoor
temperature station after the 10 minutes
have passed please follow the steps in
the detailed set up guide on page 8-9.
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