Outwardly, this device does not even come close to resembling a fire extinguisher, if only because it uses a completely different principle of fighting fire. The authors of the original idea, George Mason University students Seth Robertson and Vieta Tran, proposed using a low-frequency sound stream instead of traditional chemical fire-fighting fillers.
The success came after numerous experiments with high frequencies, for which the young researchers used conventional sound speakers. The optimal frequencies were in the range from 30 to 60 hertz.
As it turned out, a powerful sound wave "exciting" acts on the air, as a result of which oxygen is separated from the fire site by increasing the speed of air movement in the acoustic field. With increasing speed, the outermost layer of the flame becomes thinner and it becomes easier to extinguish it.
It is worth noting that George and Seth borrowed the idea of extinguishing a fire using sound waves from the advanced military development agency DARPA, slightly improving it in the form of a compact apparatus. After bringing the parameters to the appropriate standards, they hope to install it on special drones and use it to localize forest fires.