An Alibaba employee demonstrates on how to use 'UP', an augmented reality (AR) service platform, for shopping at the Alibaba booth during the 2017 Consumer Electronics Show in Las Vegas, the United States, Jan 5, 2017. From smartphones and tablets to drones and self-driving cars, tens of thousands of new tech products make their debut this week at the Consumer Electronics Show (CES) 2017, one of the world's biggest tech events. [Photo/VCG]