This Harmony XB4, plain lens blue head for pilot light is supplied with BA9s base.This head with BA9s base pilot light is designed to last without maintenance for a bright indicator of process and machine operations.It is clearly distinguishable visually at a distance thanks to a clear color of len, enabling complex machine statuses to be read at a glance.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.