Wolo (4200 The Commissioner Electronic Siren and P.A. System - 12 Volt 12-volt, 200-watt full feature electronic siren and PA system designed for emergency service responders who demand an ultra-powerful and reliable electronic siren system Select from three different siren sounds (Yelp, Hi-Lo and Wail) by using the rotary control Manual override switch allows the user to sound short blasts of two sirens sounds; air horn or a fast yelp siren Includes a P.A. system with a noise-canceling microphone that will produce high quality voice amplification without feedback or squeal The microphones push to talk button has been designed to override any siren sounds in use for PA on demand