Spitfire Pepper Spray Pepper Foam Hold-A-Phone Self-Defense Keychain Door Stop Alarm Window Alarm Motion Alarm Personal Alarm Radio Flashlight Life Hammer College Safety Book Charm Necklace *NEW* GFB Shirts GFB Euro Sticker Swiss Army Knife Door Stop Alarm - $16.95 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 may 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)