Eco-footprint / Eco-friend

Eco-footprint is a eco-friendly product which is a self-generating system using piezoelectric material, it can saving the energy transformed from walking, then give power to small-sized electric products , such as camera and MP3. It`s suitable for travel or go working , and could be saved to the case transformed into power which is used in the house. Reduce the mount of dirty air , and reuse it.