DESC: Door Stop Alarm Most security products on the market today will only alert you after an intruder has entered. This device will not only activate an alarm but will prevent unwanted intruders from entering. If an intruder attempts to enter, the alarm will sound and the unit will wedge underneath the door. The wedge shaped design and non-skid pad on the bottom of the unit will hold the door tighter the harder it is pushed. 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. An adjustable sensitivity switch prevents tampering. When traveling, just toss this lightweight unit in your luggage. The on/off switch will prevent the unit from accidentally sounding. Requires one 9 volt battery (not included).Features:Helps prevent a door from opening and immediately activates an alarmWedge