Making use of omnipresent but wasted potential energy sources is what the green movement is all about. The SONEA, designed by Jihoon Kim, Boyeon Kim, Myung-Suk Kim, and Da-Woon Chung, makes use of one of the most annoying, otherwise-useless forms of energy out there: noise. Think about how much noise there is when you walk out into a crowded city street at any given moment of the day. And it’s all for naught. Imagine if there was a reverse speaker of sorts that was able to capture all that wasted noise and store it as usable energy. The SONEA design uses a noise capturing surface paired with a sonic electric tranducer that converts the noise energy into electricity, which is then stored via an electric cell module. The device’s rating is 30 watts per 1 captured decibal.

As further outlined by the designer, capturing the noise produced by the take-off of one airplane could provide 240 kW. Given dimensions of just 450 x 450 x 80 millimeters, it would be theoretically easy to attach millions of these little devices wherever noise levels are highest. Of course, there are probably a thousand different technical flaws that will make this improbable, outlandishly expensive and/or straight-up impossible, but we can certainly dream. Judging by the last picture in the gallery, it’s also a good way to protect your junk, if all else fails. [via Yanko]