The Flexhorn is a one-way amplified horn speaker. Complete with speaker amplifier, built-in volume control and mounting bracket. The horn is weather proof and can be used indoors or outdoors in environments ranging from -4 to 131 Degree F (-20 to 55 Degree C). The Flexhorn may be mounted to walls using the supplied universal bracket; mounts to steel "I" beams using the supplied "C" clamp or flush mounted in a wall. Waterproof horn is ideal for environments requiring direct spray down such as Operating Rooms, Car Washes, Food Processing Plants. Gymnasiums, Prisons, Subway, Train Station, School, Drive-Thrush, Parking Garages.