La Crosse Technology WS-9124 - Manual (Page 6)

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2. Insert the batteries, observing the correct polarity (see
marking).
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 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 below)
Please participate in the preservation of
the environment. Return used batteries to
an authorized depot.
FUNCTION KEYS:
Temperature Station:
The Temperature Station has two easy to use function keys.
MIN/ MAX/ + key SET/ CH key