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Doors. They open… but can they stay closed???? NOW THEY CAN. A home security system can keep you safe at home, but what about when you travel on business or take your family on vacations? The DoorJammer Door Security Device is compact and portable, fitting in your briefcase, carry-on bag or backpack to protect you from intruders wherever you go. This revolutionary security device installs in seconds, creating a vertical force against outside pressure for peace of mind at home, the office and in hotel rooms.