Two new types have been added to our range of electronic Piezo-Buzzers. The model  DMC for holes with 28mm diameter has a  sound output of up to 95dB (measured at a distance of 60cm) with a volume control! The type DBZ has a sound output of 80dB (measured at a distance of 10cm). Both models have a degree of protection of IP65 and a very long life cycle.