The Professional Piezo Dynamic 50-Watt Megaphone With USB from Pyle packs a powerful large diameter bell and piezo driver for a projection range up to 0.6 miles. The megaphone runs on 8 C batteries (not included) or on a 9 V DC power supply (requires separate purchase). The megaphone features 2 modes - talk and siren, as well as a USB input so you can connect an mp3 player or other music/recording device to the megaphone.