Professional Megaphone/Bullhorn with built-in Siren and Handheled Microphone; Powers up to 40 Watts; 1000 Yard Range; Used by U.S. Army, schools, and more; For indoor/outdoor use; Variable volume control; Tough housing; Uses (6) D batteries (Not Included) Dimensions: Diameter 8" x Length 13-1/8", Weight: 2.20 lbs.