(all-clear signal) 55 Continuous tone, PFEER gasalarm 57 w. EN54-3 Continuous tone, UK BS 5839-1 60 Continuous tone 63 Continuous tone 67 Continuous tone, Germany KTA 3901 (all-clear signal) 88 Interrupted [...] tone, Sweden SS 031711 (emergency signal) 100 Interrupted tone, industrial alarm Germany 108 Interrupted tone 112 Interrupted tone, ISO 8201 (emergency evacuation signal) 116 Interrupted tone, IMO (leave [...] tone control for distinctive signalling of specific events. 3 Choice of output levels Versions for 105 dB(A) and 110 dB(A) sound pressure levels to suit a variety of signal coverage needs. 4 Strong, metal