It is often necessary to use optical signals for warning and indicating purposes in very noisy surroundings. The BLK LED emits clearly recognisable signals. The sturdy housing conforms to protection degree IP 65 and is suitable for both indoor and outdoor use. The signalling light is available in four different cap colours.The modern electronics are mounted on a printed circuit board of glass fibre reinforced epoxy resin. The weather-proof coated aluminium die- kast housing is equipped with a ribbed cap of impact-resistant plexiglass. The signalling light is provided with a M20 cable gland for cable diameters of 8 to 12 mm. Three modes (continous, blinking and flash light) are switchable.