The standard series are based on the highest piezo technology and are considered as the most robust series for industrial applications. The standard buzzers use a special shaped membrane (curved edge), which is fixed and glued into the housing. They are shockproof, as well as dust and waterproof (IP67). The different standard models cover a wide range of applications, offering functions such as continuous, intermittent, sweep, and warbler, with a sound output more than 100 dB(A).