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Step 2: Insert 02 x AA 1.5VDC battery, please take note the poles of the battery
Step 3: Insert the top plastic housing and locking by L hex key
ATTENTION:
REVERSED POLARITY OF BATTERIES IN 10 SECONDS CAN DAMAGE THE SENSOR CIRCUIT !
ATTENTION:
When reinstalling the cover, pay attention to put the PCB edge into the middle slot of the box inside as shown
below)