This Harmony ZB, blue lens cap has a round shape. It is compatible with Harmony XB4 and XB5 pilot lights with integral LED. This lens cap provides clear visual feedback on the status of your machines. It is easily installed and replaced on compatible pilot light with integral LED. It is clearly distinguishable visually at a distance due to its clear color of lens, enabling complex machine statuses to be read at a glance. Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product.