This Harmony XB4, flush blue button head with clear boot operates with a spring return / impulse mechanism. This button head with clear boot provides an ergonomic interface for controlling your machines and a simple solution to prevent dirt and contaminants. It is easily installed and replaced on compatible complete push button units and contact blocks via snap-fit assembly. 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 -40C to 70C allows versatility in usage of product. The clear boot prevents growth of bacteria in joints and gaps, it makes this product ideal for high hygiene environments.