device in the application, the more important the actual coverage volume. Particularly in an alerting application, efficiency can be of crucial, even vital, importance. Workers today are faced with an increasing [...] generally offer too little in the way of orientation, the purchase price becomes in many cases the most important selection criterion – with high-risk consequences. This situation results frequently in the installation [...] signals and to interpret them correctly so the careful choice of a signaling solution is even more important. Not every signaling device fulfils the requirements of an alerting device. In order to select the