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

Oura has launched the Ring 5, which it says is the world's smallest smart ring. The Finnish-American company has reduced the device by 40% compared to the previous model. The ring tracks sleep patterns, stress levels, and heart health. It is only 2.28mm thick and looks more like jewellery than a tech gadget. The Ring 5 costs from £399 with a monthly subscription of £5.99. Shipping starts on 4 June.