Simply place the alarm behind any door. If an intruder attempts to open the door, the wedge-shaped design will prevent it from opening and activate a 120 dB alarm. The alarm will scare off the would-be intruder and alert you to the attempted entry. The on/off switch will prevent the unit from accidentally sounding.
120 dB Alarm
3 sensitivity modes: High, Medium, Low
Great for Home, Dorm or Travel
Dimensions: 5 1/2" x 2" x 1 1/2".
One 9 volt battery (Not included)