This Harmony XB4, light block with body/fixing collar operates with BA9s base Integral LED. It has a metal body and is compatible with Harmony XB4 pilot lights. This light block allows fast and easy replacement and configuration of your signaling units. It is easily installed and replaced on compatible illuminated push button or selector switch units via clip together assembly and connected with simple screw-clamp connections. It enables visual distinction of signaling units via illumination by BA9s base Integral LED. It protects operators from unexpected contact with live circuits thanks to its IP20 protection index. It enables visual distinction of signaling units via illumination by BA9s base Integral LED. Its wide range of operating temperatures from -40°C to 55°C allows versatility in usage of product.