Feature: 1) 100W police siren 2) Which widely used in police, ambulance, fire alarm and other special vehicle. Characteristic: Full function siren. State of the art. Includes everything shown.100 watts super loud !! 7 professional police tones (Police, horn, siren, wail, yelp, ambulance, alarm ). With interphone which can talk through with it for warning. Volume control. Police siren 100W