La Crosse Technology WIRELESS WEATHER STATION Instruction Manual page 24

2. When the backlight key is switch "ON", the EL backlight will be
turned on permanently.
Note: If batteries are used, the permanent switching on the backlight
may drain off the batteries faster.
3. The EL backlight will be turned on when the alarm time is
reached.
433MHz RECEPTION
If the outdoor temperature data are not being received within three
minutes after setting up (or "- -. -" is shown in the outdoor
temperature section of the Weather station after 3 failed attempts
during normal operation), please check the following points:
1. The distance of the Weather station or transmitter should be
at least 2 metres away from any interfering sources such as
computer monitors or TV sets.
2. Avoid placing the transmitter 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. Neighbours
using electrical devices operating on the 433MHz-signal
frequency can also cause interferences.
Note:
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