E-SAW / sound-absorbing walls

‘E-SAW’ is an eco-friendly soundproof wall that may be installed alongside expressways or around a construction site: it absorbs noises and turns them into electricity, so as to emit light at night. Using noises as resources can helpful in impeding global warming. When the noises are absorbed to the wall, they vibrate the diaphragm inside the wall to generate power, which will then be saved to light the street at night.