The Professional Piezo Dynamic 50W Megaphone with USB from Pyle packs a powerful large-diameter bell and piezo driver for a projection range up to 1 mile. The megaphone runs on 8 C batteries (not included) or on a 12 VDC 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.