La Crosse Technology WS-9121 - Manual (Page 36)

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metal or highly polished surface is in the immediate vicinity (garage
doors, double glazing, etc.). Before securing in place, please ensure that
the Temperature Station can receive the 915MHz signal from the
temperature transmitter at the positions that you wish to place them.
CARE AND MAINTENANCE
9 Extreme temperatures, vibrations and shocks should be avoided as
these may cause damage to the unit and give inaccurate forecasts
and readings.