Two engineering students from George Mason University in Virginia, America have stunned their professors by inventing a fire extinguisher that uses sound to put out flames.

By blasting a fire with low frequencies between 30 and 60 hertz range, the extinguisher separates oxygen from fuel, explains inventor Viet Tran, who built the device with fellow student Seth Robertson. “The pressure wave is going back and forth, and that agitates where the air is. That specific space is enough to keep the fire from reigniting.”

Watch the short Video below.