Werma signaltechnik led permanent beacon for tube mounting werma signaltechnik 20921075 the werma signaltechnik 20921075 is a green led permanent beacon designed for tube mounting the permanent light makes the operator and others aware of a specific condition or is instructed to carry out a certain course of actionthe beacon is supplied 24v acdc it is rugged and compact in design economical and reliable the beacon is ideal for plant and construction sites werma signaltechnik 20921