[Working Mode]: Push and HOLD, Normally Open Circuit ON. Release, Normally Open Circuit OFF. Contact Configuration: 1NO1NC; SPDT ON/OFF. Used in Single circuit switch or DUAL circuit change-over..[LED Indication]: DC12V LED Ring. DO NOT connect to circuit voltage over 12V which will short the LED indicator. Indicator can be ALWAYS-ON or ON/OFF along with circuit..[Mounting]: Diameter size:19mm. Mounting hole diameter should be at least 19mm(0.75”) and Smaller than 19.2mm(0.76”)..[Reliable Material]: Stainless steel 304 and tough plastic shell. 100,000 times electrical lifelong internal silver contact..[Protection]: CE certified and 3-Year Care. With IP67 grade and IK08 protection, waterproof and anti-dust. This pushbutton switch can work in wet condition but NOT under water.