The NBA is offering players a 'smart' ring to track Covid. But does it even work?

The NBA, which hopes to restart the season July 30, says it is offering players a ring whose maker claims it can track a user's health data and even predict if users are about to show symptoms of coronavirus infection.

source https://www.cnn.com/2020/06/21/health/nba-smart-ring-tracking-covid/index.html