If you need a bullhorn-style megaphone capable of projecting your voice up to 1700 yards, check out the PMP53IN 50W Pistol-Grip Professional Megaphone from Pyle Pro. With 50W of power at its disposal, this bullhorn will ensure your voice will be heard almost a mile away.
A volume control lets you adjust the level of your voice to the needs of your area, while a built-in siren and alarm can be used to get attention or alert people. An external audio device such as an iPod or an MP3 player can be plugged into the bullhorn by means of its 3.5mm jack. The housing is lightweight, yet the sound is powerful, thanks to the dynamic piezo driver and the shape of the horn.