PRO MEGAPHONE WITH SIRENPYLE PRO PMP30 Professional Megaphone/Bullhorn with SirenFeatures of PRO MEGAPHONE WITH SIREN 30W power; 800-yard range; Used by US Armed Forces; Indoor/outdoor use; Variable volume control; Tough housing; Built-in siren; Dim: 10"L x 6.25" dia; Weight: 1.15lbs; Requires 4 D batteries;Specification of PRO MEGAPHONE WITH SIREN..