Door-Tapping Detector

The door-knocking detector. There are two levels of sensitivity:-a condition of high sensitivity-H in this detector will respond to any light contact at the door.-Low Sensitivity mode-L in which the detector will respond to a stronger touch. The detector operation causes a quick blink that lasts 5 seconds. The detector is easily attached to the door and can be transported from door to door. The detector is running on battery.