railway crossing) wav 1.1 MB Download Alternating tone wav 980 KB Download Alternating tone France NFS 32-001 (fire alarm) wav 1.0 MB Download DS sounders Audio-Number Description Graphic Audio Sample 2 [...] tone, UK BS 5839-1 (fire alarm, railway crossing) 142 Alternating tone 146 Alternating tone, France NFS 32-001 (fire alarm) 1 Die-cast aluminium housing Resistant to UV light, seawater, and many chemicals