Simply place this alarm behind any door. If an intruder attempts to open the door, the wedge-shaped design will not only prevent it from opening but it will also activate the alarm. The alarm will scare off the would-be intruder and alert you to the attempted entry. An adjustable sensitivity switch prevents tampering. For travel, just toss this lightweight unit in your suitcase. The on/off switch will prevent the unit from accidentally sounding.

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