A surveillance camera atop a trade building in downtown Wenzhou, East China's Zhejiang province, Dec 11, 2011. The local security department has set up four electronic eyes on top of the Wenzhou World Trade Center, the tallest building in the city at a height of 333 meters, in a bid to enhance its security patrol, traffic control and fire rescue. The monitors' scope is said to cover the whole urban area. [Photo/CFP]