Item Type: 2 Way Vibration Sensor Module Material: ABS Working Voltage: 3.3V-5V Output Form: Digital Switch Output (0 and 1) Small Board PCB Size: Approx. 3.2 x 1.7cm / 1.26 x 0.67in Equipped with fixing bolts holes for easy installation, using a wide voltage LM393 comparator1Vibration Switch: The alarm module uses the highly sensitive SW?420 vibration switch, and uses a wide voltage LM393 comparator 2Strong Drive: Alarm module has comparator output, with clean signal, good waveform, strong drive ability, more than 15mA 3Sensitivity Adjustment: The potentiometer adjusts the sensitivity, the alarm module is in the form of digital switch output 4Simple Operation: This 2 channel vibration sensor module has fixing bolts holes , and that for easy installation and easy use 5Basic Specifications: This 2 way vibration sensor module operates at 3. 3V-5V, and the small board PCB size is 3. 2 x 1. 7cm 1 x Vibration Sensor Module