Touch Activated Door Alarm

Our high-tech security alarm transforms an ordinary doorknob into a highly touch sensitive burglar alarm. Unlike other alarms, We use a new circuit which can make the alarm work for 2 months, it is power conception, and better than ordinary door alarm from other supplier, which can only use for 1-2weeks. No installation required, just simply hang on the inside doorknob of unmetal door, or your luggage, very convenient and much increase your safety of home, office, hotel, warehouse or personal belongs etc.