A staff member shows a face recognition lock during Public Securtiy Exposition North-East China 2014 in Shenyang, capital of northeast China's Liaoning Province, April 23, 2014. (Xinhua/Yao Jianfeng)
Visitors talk in front of a board displaying high-definition monitors during Public Securtiy Exposition North-East China 2014 in Shenyang, capital of northeast China's Liaoning Province, April 23, 2014. (Xinhua/Yao Jianfeng)