About Doorstop Alarm:
* The door stop alarm is for indoor use only.
* Use a 9V battery.
* With ON/OFF switch.
* Insert the alarm at the base of your door, making sure the non-skid pad on the bottom of the alarm is in firm contact with the floor.
* When the door is opened, the alarm? metal plate is depressed, which presses down the trigger anchor and sounds the alarm.
* To silence the doorstop alarm, turn it OFF.
* Alarm sound: 120dB.
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(Doorstop Alarm) 
Product Feature