Werma signaltechnik 645 810 55 siren element 645 for kombisign 71 werma signaltechnik 645 810 55 p the werma signaltechnik 645 810 55 is a siren element with self adjusting sound output for kombisign 71 the siren element adjusts its sound output to the ambient noise by emitting a sound which is well audible without being irritating loud p werma signaltechnik 645 810 55 siren element 645 for kombisign 71