The U.S. International Trade Commission will investigate an intellectual property infraction case linked to imports of smart doorbells by Vivint Smart Home, Simplisafe and Arlo Technologies. Total U.S. seaborne imports linked to the three rose by 86.4% year over year in Q4’20 including a 420% surge in shipments associated with Vivint Smart Home. At the same time there’s been a downturn in U.S. imports of doorbells more broadly, running contrary to increased spending on home maintenance. Total U.S. imports declined by 16.7% year over year in the three months to Nov. 30, including...