This Harmony ZB, red lens cap has a round shape. It is compatible with Harmony XB4 and XB5 push button with flush push and BA9s base. This lens cap provides clear visual feedback on the status of your machines. It is easily installed and replaced on compatible illuminated push buttons with flush push and BA9s base. 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 -40C to 70C allows versatility in usage of product.