A combination of several horn, electrical with different frequences.
NSN 6150-01-406-8168
NSN 5930-01-270-9773
NSN 6135-01-508-6083
NSN 2925-00-964-7128
NSN 5895-01-503-1698
NSN 5920-01-365-0934
NSN 6150-00-153-3196
NSN 5910-01-038-8698
NSN 5920-00-757-9140
NSN 5930-00-499-4488
NSN 5996-00-425-7481
NSN 6320-00-688-9983