LAS VEGAS, NV - JANUARY 05:  An Alibaba employee demonstrates 'Smile to Pay', an automatic payment system that authorize payment via facial recognition, at the Alibaba booth during CES 2017 at the Las Vegas Convention Center on January 5, 2017 in Las Vegas, Nevada. CES, the world's largest annual consumer technology trade show, runs through January 8 and features 3,800 exhibitors showing off their latest products and services to more than 165,000 attendees.  (Photo by Alex Wong/Getty Images)