Visitors are tracked by face recognition technology from state-owned surveillance equipment manufacturer Hikvision at the Security China 2018 expo in Beijing. Hikvision is one of several firms that have been added to a U.S. trade blacklist.

Visitors are tracked by face recognition technology from state-owned surveillance equipment manufacturer Hikvision at the Security China 2018 expo in Beijing. Hikvision is one of several firms that have been added to a U.S. trade blacklist.