SSTX3-MV is an economical yet explosionproof electronic siren capable of producing three high decibel tones from the same unit. The integrated circuitry is contained in a rugged die cast aluminum housing. The unique threaded rear access cover eliminates traditional time consuming bolting patterns. The access cover is also equipped with a braided cable lanyard securing it to the housing whenever the cover is open for installation or maintenance. The model SSTX3-MV can be used as a stand-alone, full output, audible warning device in any explosionproof environment where multiple tones are needed but voice paging is not required.