Pyle Professional megaphone/bullhorn with an inbuilt siren is used by US army, navy, air force and marines. Megaphone is portable with a carry strap providing 30 W output power features volume controls with an LED indicator. Weight: 1. 15 lbs. Warranty: 1 year. Used by U. S. army, schools and more. Powers up to 30 W. Variable volume control. Dimensions: 10"(L) x 6 1/4" (dia). Output power: 30W. Built-in siren. Tough housing. 1000 yard range. Uses 4 x D batteries, not included. Pyle Professional megaphone/bullhorn with inbuilt siren and rugged housing renders a projection range up to 800 yards. Pyle Professional megaphone/bullhorn with an inbuilt siren is used by US army, navy, air force and marines. Megaphone is portable with a carry strap providing 30 W output power features volume controls with an LED indicator.