IN03B: Hanging door knob alarm working video.
Hanging door alarm is an effective low cost vibration and static alarm that can be used for securing doors. When an intruder is attempting to break-in and the door vibrates more than normal or is broken, the vibration and static sensor trigger the alarm.
This touch door alarm is a lightweight and easy-to-use security device which can transform an ordinary doorknob into a touch and vibration sensitive burglar alarm. In order to gain easy access to your home, burglars will first try your doors to see if they are unlocked. Super-sensitive knob alarm is inexpensive and requires no special wiring. Just hang on the inside door knob, the piercing alarm will scare off any unwanted intruders, leaving you and your home well protected. System works even if the intruder comes within inches of the knob!