SMAKN&reg; SW-1801P Vibration Sensor Module 3.3-5V, LM393 Voltage Comparator For a variety of shock triggering effect , reported stolen alarm, smart car , electronic building blocks and so on. Please note that this module is triggered when the time will be very short induction into small vibration , enough to drive the relay . 1. high sensitivity vibration switch , default by SW-18010P vibration sensors . 2. the comparator output signal is clean, good waveform , driving ability , more than 15mA 3. the working voltage of 3.3V-5V