Most security alarms only alert you after an intruder has entered. The Safety Door Stop Alarm (Door Wedge Alarm) will not only activate an alarm, but will prevent unwanted intruders from entering in the first place.
If an intruder attempts to enter your room, the Door Stop Alarm will sound and the unit will wedge underneath the door. The wedge shaped design and non-skid pad on the bottom of the door stopper alarm holds the door tighter the harder it’s pushed and the alarm won’t stop until the pressure is released from the metal top plate or you flip the alarm switch to the off position.