La Crosse Technology WS7034UITCA Instruction Manual page 9

TEMPERATURE SENSOR
The Temperature sensor uses 2 x AA, IEC LR6, 1.5V batteries. To install and replace the batteries,
please follow the steps below:
1. Remove the cover at the back of the sensor.
2. Insert batteries observing the correct polarity (see marking).
3. Replace compartment cover.
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