This Harmony XB4, flush greybutton headoperates with a spring return / impulse mechanism. It is easily installed and replaced on compatible complete push button units and contact blocks via snap-fit assembly. It is clearly distinguishable visually at a distance thanks to clear color. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66. It has a metal bezel, this makes it Ideal for applications requiring high impact and vibration resistance. It is designed to fit in a standard 22mm cutout, ensuring compatibility when installing in pre-existing machinery. Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product.