Engineered for super power, the Hamilton MM-9 Megaphone with Siren and External Microphone can project a voice or siren up to 1/2 mile distance with exceptional clarity. Lightweight, compact and ruggedly built of steel and plastic, it resists impact, all outdoor climactic conditions. The MM-9 Megaphone (Bullhorn) offers exceptional power as well as great value. One (1) year warranty.