The Pyle PMP35R Megaphone Bullhorn is compact, powerful and portable. With each iteration of flagship megaphones, we've improved the battery life, power, and ergonomics. Features include voice recording capability with 10 second integrated audio memory that allows you to easily record your voice and repeat the message. Enjoy 30 watts of output power, so the sound will reach up to 800 yards away! Also 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.