Policemen wear their new shoulder lights at a ceremony to launch the use of the night lights in Southwest 皇冠体育app's Chongqing on July 25, 2013. The shoulder lights are being used by the city’s police for the first time and will make policemen on patrol visible for 100 meters. Other public security guards will also be equipped with the lights, which can run for five days on two batteries. [Photo/CFP]

An electrician works to examine and repair electrical facilities in Yantai, East 皇冠体育app's Shandong province, July 25, 2013. [Photo/Xinhua]