La Crosse Technology WS-9125 - Manual (Page 15)

15
Note:
In the event of changing batteries in any of the units, all units need to be
reset by following the setup procedures. This is because a random
security code is assigned by the sensor at start-up and this code must be
received and stored by the Temperature Station in the first few minutes of
power supplying.
BATTERY CHANGE:
It is recommended to replace the batteries in all units regularly to ensure
optimum accuracy of these units. (Battery life - see Specifications)