La Crosse Technology WS-9125 - Manual (Page 12)

12
After the three sensors have been set up, user may need to check the
readings displayed on the temperature station against those being shown
on the sensor displays, in order to recognize on which channel each
sensor is being presented.
IMPORTANT:
Transmission problems will arise if the setting for additional sensors is not
followed as described above. Should transmission problems occur, it is
necessary to remove the batteries from all units and start again the set-up
from step 1.