SainSmart Vibration Shock-Switch Sensor Module Alarm Module for Arduino R3 Robot, Switch Shock product no vibration, vibration switch is disconnected, the output end of the output high level, the green light is not bright product vibration, the vibration switch transient conduction, output of low level, the green light is lit output can be directly connected to micro-controller, through single chip microcomputer to detect the high and low level, thus to detect whether there is a vibration environment, call the police