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? Battery: two pieces of button batteries (please attention the polarity).

? Insulating strip of battery: to cut off the power to longer the usage of battery when the sensor will be halted to use; it can be used once removing the strip.

? Alarm/ Low-power indicator: when the product was triggered and making alarm, the indicator lights on 2 seconds and turn off circulating; when the product is on the status of low power, the indicator is on weak light to alert the user to replace it with the new batteries. 

? Magnet: realize to make alarm by cooperating with the switch.

? Installation arrows: to assure the two arrows close and align when installing. 

? Guiding lighter: derive the light of the Alarm/ Low-power indicators.