Powers Up to 40 Watts - For Indoor/Outdoor Use - Dimensions: Diameter 8'' X Length 13 1/8''.10 Second Integrated Audio Memory - Variable Volume Control - Weight:2.70Lbs.Replay and Recording Audio Function - Tough Housing.1000 Yard Range - Built-In Siren.Used By U.S. Army, Schools, And More - Operates by Rechargeable Batteries Included or 6 X D Batteries (Not Included) This Pyle Pro dynamic megaphone makes your voice sound huge! It's got 40 watts of power, a 1000 yard range, and a built in siren. Grip the handle and speak, or detach the microphone to let your voice be heard. This megaphone even has a 10-second recording function, so you can easily play back a prerecorded message - get it right every time. Volume control allows you to adjust the sound to your liking. Use the included rechargeable batteries, or 6 x D batteries (not included).