Audio Modes: Talk, Siren, Music, Whistle, Record 60 seconds Aux (3.5mm) Input: Connects MP3s, music, or digital audio Adjustable Volume: Ergonomic pistol grip and adjustable shoulder strap Built-in Siren: Automatic siren alarm for emergencies Projection Range: Covers up to 400 square yards Lightweight & Portable: Ideal for both indoor and outdoor use Battery Powered: Requires 4 x 'C' batteries (not included)