This Harmony XB4, flush green button head with clear membrane silicone boot operates with a spring return / impulse mechanism.This button head with clear membrane silicone boot provides an ergonomic interface for controlling your machine and a simple solution to prevent dirt and other 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 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.