In order to build itself into a smart city, the city of Yulin in northwest China's Shaanxi Province has combined technological elements with innovative ideas by installing wireless solar-powered charging piles along its streets.

The solar energy is converted into electric energy and stored in the battery in the pile, which can then be used to charge mobile phones in a wireless way for free for 24 hours. The inventive equipment has greatly solved the dilemma that mobile phones users could run out of the battery when going out.