La Crosse Technology WIRELESS WEATHER STATION Instruction Manual page 67

3. Using other electrical products such as headphones or speakers operating
on the same signal frequency (868MHz) may prevent correct signal
transmission and reception.
4. Neighbours using electrical devices operating on the 868MHz signal
frequency can also cause interference.
Note:
When the 868MHz signal is received correctly, do not re-open the battery cover of
either the transmitter or Weather 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.
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