An exhibitor displays a smart suitcase which can follow its owner automatically at the 2020 Consumer Electronics Show (CES) in Las Vegas, the United States, Jan. 9, 2020. The four-day, annual tech show, opened on Tuesday, drew more than 4,500 exhibitors from over 160 countries and regions, including around 1,000 Chinese companies, according to the Consumer Technology Association. (Xinhua/Wu Xiaoling)