Insert the AA battery, please take note the poles of battery
Insert the top plastic housing and locking by M2 screw
NOTE:
Because of O-ring, it requires to have much pulling force at the beginning, therefore please do it
carefully to avoid the damage of circuit board which is very thin (1.00mm);
ATTENTION: REVERSED POLARITY OF BATTERY IN 10 SECONDS CAN DAMAGE THE SENSOR CIRCUIT
