The Harmony XB4, flush red button head operates with a spring return / impulse mechanism, is used in harsh environments. This button head provides an ergonomic interface for controlling your machines, and 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. The Harmony XB4 is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66. It has a metal bezel, which makes it ideal for applications requiring high impact and vibration resistance. The Harmony XB4 is designed to fit in a standard 22mm cutout, ensuring compatibility when installing in pre-existing machinery. It can operate within a wide range of operating temperatures from -40°C to 70°C, allowing for versatility in the usage of this product.