Feature:1. Vibration Switch: The alarm module uses the highly sensitive SW420 vibration switch, and uses a wide voltage LM393 comparator2. Strong Drive: Alarm module has comparator output, with clean signal, good waveform, strong drive ability, more than 15mA3. Sensitivity Adjustment: The potentiometer adjusts the sensitivity, the alarm module is in the form of digital switch output4. Simple Operation: This 2 channel vibration sensor module has fixing bolts holes , and that for easy installation and easy use5. Basic Specifications: This 2 way vibration sensor module operates at 3.3V-5V, and the small board PCB size is 3.2 x 1.7cmSpecification:Item Type: 2 Way Vibration Sensor ModuleMaterial: ABSOutput Form: Digital Switch Output (0 and 1)Small Board PCB Size: Approx. 3.2 x 1.7cm / 1.26 x 0.67in.Package List:1 x Vibration Sensor ModuleNote:The output terminal can be directly connected to the single chip microcomputer, and the high and low level can be detected by the single chip computer, so as to detect whether there is vibration in the environment, and play an alarm function.