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Efficient and economical traffic clearing mini-sirenMS4000 offers value-packed, reliable performance with effective traffic clearing capability. Reliability is increased and operating temperature is decreased in the design of the MS4000 with the use of advanced rail circuitry and low-loss FET design arrangement.Versatile and compact siren with built-in featuresMS4000 mini-sirens provide 100 Watt output and meet Class A requirement when paired with any Federal Signal speaker. It is protected against failure models, including reversed polarity, by a fuse that can be replaced without tools.