This Pyle Pro dynamic megaphone makes your voice sound huge! It"s got 50 watts of power, a one mile range, and a built in siren. The powerful piezo driver and large bell diameter make this megaphone extremely effective in both indoor and outdoor applications. 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, 8 x C batteries (not included), or a DC 12 V power supply (not included.)