This Harmony XB4, plain lens illuminated flush yellow 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 clearly distinguishable visually at a distance thanks to illuminated head and clear colors. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP69K. 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. The clear boot prevents growth of bacteria in joints and gaps, it makes this product ideal for high hygiene environments. It provides high brightness for easy identification of function and operation mode, even in brightly lit environments.