Werma signaltechnik wall mount signal horn werma signaltechnik 58400075 the werma signaltechnik 58400075 is a wall mount signal horn in an attractive housing the signal horn has an adjustable sound output of up to 96db making it suitable for large or small areas with high ambient noise levelsthe horn is supplied with an input voltage of 24v dc and is supplied with a trumpet the integrated mounting bracket ensures that the product can be easily fixed to walls or machines the horn has