SpeedTech Lights Apex 150-Watt Police Siren and Emergency Vehicle Siren System with Horn and PA Microphone LOUD & POWERFUL - 150-watt siren system output MULTIPLE SIREN TONES - Wail, Yelp, Sting, Tool, Hi-Lo MANUAL SIREN & HORN - Manual toggle for siren and horn SLIDE SWITCH + A/B/C/D BUTTONS - Connect warning lights to these buttons for full vehicle control LED INDICATOR - Buttons light up when powered on