Siren with speaker *Power:100w,150w,200w,300w,400w available *ISO,CE certificated *With high quality *12v or 24v Product detail:1.Tone: yelp, Horn,engineering, Hi-lo, Wail, engineering, Yelp-s, high-frequency impulse, Siren. 2.voltage: 12V 3.microphone with volume control auto siren with speaker