New great invention that help the enviroment

These slab charge electricity for every foot step!

 

         This is an efficient product because it can save electricity to power street light, board sign, and advertising too!!!

Also this product going to be used  in the 2018 England Olympics, In my opinion this is magnificent product for saving our earth energy!

                  
     My concern is people might steal the green slab or even damage it.

        

Personal nagative