AlarmChina Plug in Proximity Sensor (LJ8A3, LJ12A3, LJ18A3, LJ30A3) Series with M12 Connector Inductance Metal Sensor Without Cable, Find details about China Plug in Proximity Switch, Metal Sensor from Plug in Proximity Sensor (LJ8A3, LJ12A3, LJ18A3, LJ30A3) Series with M12 Connector Inductance Metal Sensor Without Cable