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Company Sentry Siren Incorporated
Produced 2004-2011
Type Electromechanical
Sound output 127 dBc at 100 feet
Frequency 460 or 920 Hz
Horsepower 7.5
Product sheet

The Defender was a rotating siren produced by Sentry Siren Incorporated. It produces either 460Hz or 960Hz, depending on customer preference. Like other Sentry models, it was available in stainless steel for added corrosion resistance. It was discontinued due to low sales and Sentry's preference for omnidirectional models.