La Crosse Technology WS-9124TWC-IT Instruction Manual page 11

received about 2 minutes after setup (the signal reception icon does
not appear), please check the following points:
1. The distance of the Temperature Station or sensor should be
at least 1.5 to 2 meters away from any interfering sources
such as computer monitors or TV sets.
2. Avoid positioning the Temperature Station onto or in the
immediate proximity of metal window frames.
3. Using other electrical products such as headphones or
speakers operating on the same signal frequency (915MHz)
may prevent correct signal transmission and reception.
4. Neighbors using electrical devices operating on the 915MHz
signal frequency can also cause interference.
Note:
When the 915MHz signal is received correctly, do not re-open the
battery cover of either the sensor or the Temperature Station, as the
batteries may spring free from the contacts and force a false reset. If
this happens accidentally, all units must be reset (see Setting up
above) otherwise transmission problems may occur.
The transmission range is about 330 ft. (100 m) from the sensor to
the Temperature Station (in open space). However, this depends on
the surrounding environment and interference levels. If no reception
is possible despite the observation of these factors, all system units
have to be reset (see Setting up above).
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