Visitors check the back of a see-through display during the 2020 Consumer Electronics Show (CES) in Las Vegas, the United States, Jan. 7, 2020. The world's premier tech show was officially launched on Tuesday in Las Vegas, the United States. More than 4,500 exhibitors joined the annual show with nearly 20,000 new transformative tech products, encompassing 5G connectivity, artificial intelligence, augmented and virtual reality, smart cities and resilience, sports, robotics and more. (Xinhua/Wu Xiaoling)