PYLE-PRO Portable Megaphone Speaker Siren Bullhorn - Compact and Battery Operated with 20 Watt Power, Microphone, 2 Modes, PA Sound and Foldable Handle for Cheerleading & Police Use-PMP23SL (Silver)VOICE MODE: The megaphone speaker has 2 audio modes. The first one is voice mode wherein the bullhorn amplifies a voice or sound spoken into the microphone. This mode is most commonly used in cheerleading and other school activities SIREN ALERT MODE: The second mode is siren alter mode. With this mode, the bullhorn can act as a siren and sound an emergency alarm tone with just a push of a button. This mode can be used by the police and anyone else 20