Ton type Frequency in Hz Description Use alternating 800/970 2 Hz (250 ms-250 ms) listen download rising 800/970 7 Hz (7/s) listen download rising 800/970 1 Hz (1/s) listen download continuous 2.850 111 listen download rising 2.400-2.850 7 Hz listen download rising 2.400-2.850 1 Hz listen download rising 500-1.200 3 sec., then 0.5 sec. OFF, then repeat Slow Whoop Holland listen download falling 1.200-500 falling in 1 Hz stroke DIN/PFEER (PAPA), DIN 33404-3, VDS-tested listen download alternating 2.400/2.850 2 Hz (250 ms-250 ms) listen download pulse 970 0,5 Hz (1 sec. ON / 1 sec. OFF) PFEER Alarm listen download alternating 800/970 1 Hz (500 ms-500 ms) listen download pulse 2.850 0,5 Hz (1 sec. ON / 1 sec. OFF) listen download intermittent 970 0,8 Hz (250 ms ON / 1 sec. OFF) listen download continuous 970 PFEER - Toxic Gas listen download alternating 554/440 100 ms-400 ms French Alarm Signal listen download pulse 660 3,3 Hz (150 ms ON / 150 ms. OFF) Swedish Alarm Signal listen download pulse 660 0,28 Hz (1,8 sec. ON / 1,8 sec. OFF) Swedish Alarm Signal listen download pulse 660 0,05 Hz (6,5 sec. ON / 13 sec. OFF) Swedish Alarm Signal listen download continuous 660 Swedish Alarm Signal listen download alternating 554/440 0,5 Hz (1 sec. ON / 1 sec. OFF) Swedish Alarm Signal listen download pulse 660 1 Hz (500 ms-500 ms) Swedish Alarm Signal listen download pulse 2.850 4 Hz (150 ms ON / 100 ms OFF) listen download rising 800-970 50 Hz listen download rising 2.400-2.850 50 Hz listen download pulse 970 3x500 ms. pulse, 1.5 sec. silence, then repeat ISO 8201 / US Temporal listen download pulse 2.850 3x500 ms. pulse, 1.5 sec. silence, then repeat ISO 8201 / US Temporal listen download continuous 4.000 listen download alternating 800/970 2 Hz (250 ms-250 ms) listen download alternating 990/650 2 Hz (250 ms-250 ms) listen download alternating 510/610 2 Hz (250 ms-250 ms) listen download rising 300-1.200 1 Hz listen download continuous bell listen download continuous bell 3x500 ms. pulse, 1.5 sec. silence, then repeat Glocke / US Temporal listen download alternating 1.000/2.000 1 Hz (500 ms-500 ms) Singapore listen download pulse 420 0,625 sec. Australian Alarm Signal listen download rising 500-1.200 rising 3.75 sec., then 0.25 sec. OFF Australian Alarm Signal (Evacuation) listen download rising 1.400-1.600 rising 1 sec., falling 0.5 sec. NF C 48-265 listen download rising 500-1.200 rising and falling over 3 sec. Siren listen download pulse 720 0,7 sec. ON, 0,3 sec. OFF German Industrial Alarm listen download rising 422-775 0.85 sec., 1 sec. silence, then repeat NFPA Whoop listen download continuous 470 Horn (USA) listen download continuous 370 Air Horn (USA) listen download