People look at the trial flight operation of a police rocker helicopter in Hangzhou, capital of east China's Zhejiang Province, Oct. 10, 2012. Equipped with a minisize digital camera on its head, the rocker helicopter is remotely controled by GPS signals from ground operator. It could support the security work by transmitting real-time pictures above the West Lake, during the 2012 Hangzhou International Fireworks Show, which will kick off on Saturday. (Xinhua/Wu Huang)
