Monsterrhino Hall Sensor is a magnetic limit switch. It reacts to a south pole of a magnet. A built-in led indicates the switch state. The contactless switching offers a long life expectancy. It´s enclosed in a sealed polypropylene body with industrial dimensions and an M3 mounting hole. The Monsterrhino Hall Sensor runs with voltages from 3.3VDC up to 24VDC.