La Crosse Technology WS-9125 - Manual (Page 11)

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7. Insert the batteries to the third sensor immediate after (in 10
seconds after) inserting battery to the second sensor.
8. Then within 2 minutes, the channel 3 outdoor data from the third
sensor will be displayed and the channel icon will shift back to "1"
once the third sensor is successfully received. If this is not happen,
user shall restart the setting up from step 1.
9. In order to ensure sufficient 915 MHz transmission there should be
no more than 330 feet (100 meters) between the final position of
the Temperature Station and the sensor (see notes on
“Positioning” and “915 MHz Reception”).
Note: