To meet the current and future needs of designers of industrial control equipment, Mallory used its 40 years of audible alarm knowledge to reduce the size of the industrial audible alarms to fit in a standard 22 mm panel cut-out hole without sacrificing quality or performance. The alarms are inherently tamper-proof which means that the nut is assembled on the back side of the panel to prevent the alarm from being loosened or removed. Connection is made to the alarm via a detachable Euro-style terminal block which is finger-proof safe.