Door Alarm 1.with a small switch key 2.strong magnet and long range 3.sound siren instantly 4.CE, RoHS certificates Door Alarm Introduction: This door alarm, at only 2 1/2 inches long, inconspicuously protects your home from intruders. This unit uses a magnetic sensor to detect the opening of a protected window. A 105 dB alarm will then alert you to an attempted entry and scare off potential ...
