Wolo (4000-2 Alert 80 Watt Electronic Siren and Speaker - 12 Volt 12-volt, 80-watt full feature electronic siren and P.A. system that has re-designed to offer more features that first responders demand Built with state-of-the-art electronics to ensure years of dependable service The adjustable metal swing bracket, combined with the controllers compact size, makes mounting possible in vehicles that have limited available open space in the dash area There are five powerful siren sounds and a P.A. system that has an adjustable volume by using the rotary on/off control There is also a manual override switch that the user can press and release for short blasts of two siren sounds; air horn sound or fast yelp siren sound