We consider critical components these having a final acoustic warning signal in dangerous applications such as : life support systems and equipment used to warn for life danger such as: portable gas detectors, medical monitoring equipment, aircraft cockpit alarm's, car breaking alarm's etc...

Components used as an acoustical function in order to indicate continuous supervision of a control fuction being an audible warning of emmediate danger of changes in situations  or conditions of environment as life danger or critical function.

In all above described functions, applications and use we recommend our Standard-series and Smac-series. All other models or series can only be used after written approval of the Sonitron application support department or management with test recommendations after receipt of the described application in detail by the customer.