La Crosse Technology WS-9121 - Manual (Page 14)

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HOW TO INSTALL AND REPLACE BATTERIES IN THE
TEMPERATURE TRANSMITTER
The Temperature transmitter uses 1 x IEC CR2032, 3.0V battery. When
battery needs to be replaced, the low battery icon
will appear on the LCD of the Temperature Station-
or replace battery every 12 months. To install and
replace the batteries, please follow the steps
below:
1.
Remove the battery compartment cover at
the back of the transmitter.
2. Insert the battery, observing the correct
polarity (see marking).