Click green flag. Warning: loud noise!
Credit to all. Title: Siemens Cerberus DIF 24 fire alarm sounder. This is a french Siemens Cerberus DIF 24 fire alarm sounder which is an older Roshni sounder but with the Cerberus logo on it. This sounder either plays the NFS 32001 tone (french fire tone) or a continuous tone. The sounder featured in the project plays the NFS 32001 tone. This is called DIF 24 because DIF stands for "diffuseur sonore" which means "fire sounder" in french and 24 stands for 24 V because they run on 24 VDC but there is a 48 VDC variant of the same sounder known as DIF 48.
