The Undercover Siren is ideal for volunteers or detectives who do not need public address and radio rebroadcast built into their siren. The siren powers a speaker up 100w with ease. It comes with a switch to choose between a yelp or a wail and has a button for the air horn. Please see the Information tab to hear all three sounds and to look at how to set up the siren and switch box. The switch box has room for additional switches to be added for lights, flashers, etc.