La Crosse Technology WS-9031U - Manual (Page 41)

1. The distance of the Weather Projection Station or sensor should be at
least 6 feet (2 meters) away from any interfering sources such as
computer monitors or TV sets.
2. Avoid placing the Thermo-hygro sensor onto or in the immediate
proximity of metal window frames.
3. Using other electrical products such as headphones or speakers
operating on the 433MHz-signal frequency may prevent correct signal
transmission or reception. Neighbors using electrical devices operating
on the 433MHz-signal frequency can also cause interference.
Note:
When the 433 MHz signal is received correctly, do not re-open the battery
cover of either the sensor or Weather Projection Station, as the batteries may
spring free from the contacts and force a false reset. Should this happen
accidentally then reset all units (see “Setting up” above) otherwise
transmission problems may occur.
The transmission range is around 65-82 feet (20-25 meters) from the sensor to
the Weather Projection 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).