La Crosse Technology WS-9121 - Manual (Page 15)

52
3. Replace the battery cover on the unit.
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 transmitter 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 every 12 months to
ensure optimum accuracy of these units.