• Double sensor (electrostatic sensor/ vibration sensor) • Electrostatic sensor detect through doorknob trigger alarm or chime or flash light • Power failure led flashlight • Super white (or red) led for flash light • 3 "aa" size batteries (not included) operation with dc jack • Vibration sensitivity high / low switch • Easily hangs over the top of the door (dracket included) • Vibration sensor detect door knock signal - trigger alarm or chime or flash light
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