A combination of several horn, electrical with different frequences.
NSN 5895-01-305-2192
NSN 7035-01-433-3547
NSN 5950-01-651-8096
NSN 5895-00-051-4758
NSN 6110-00-757-5325
NSN 6150-00-363-7102
NSN 6650-01-631-7780
NSN 5835-00-838-0707
NSN 5985-01-286-7076
NSN 6105-00-220-2737
NSN 5910-01-146-0901
NSN 5990-01-486-2556