The Pyle PMP30 Megaphone Bullhorn is compact, powerful and portable. With each iteration of flagship megaphones, we’ve improved the battery life, power, and ergonomics. This model has 30 watts of power, so your voice will reach up to 800 yards away! Features includes built-in button activated siren alarm function, adjustable volume control, convenient folding hand grip and the durable style is even trusted and used by U.S. Armed forces. Battery powered and requires 4 x 'D' batteries (not included). Works great indoors or outdoors.