Oura Launches Ring 5, World's Smallest Smart Ring, as IPO Approaches

Oura is a company. They made a new ring. It is very small. The ring is 2.28mm thick. It looks like jewelry. The ring tracks sleep. It tracks stress too. It tracks heart health. The ring costs £399. Plus £5.99 every month. People can buy it now. Ships start on 4 June.