Compro squashni sounder 91db 32 tone compro sqr the compro sqr is a red squashni conventional sounder that has many qualities of the roshni in the form of a base sounder for use with almost any available fire detector the flat deck area can also be used with beacons to provide a compact audio visual alarm device with the added economy of a single installation pointthe squashni sounder provides the perfect combination of high sound output and low current compro sqr squashni sounder 91db