Oura Ring 5 review: slimmer smart ring with up to 9 days of battery

The Oura Ring 5 is 40% smaller by volume at 6.09mm wide and 2.28mm thick, weighing from 2g. Battery life is rated at six to nine days, and new app features include Live Activity Tracking and Health Radar, though many will also reach Ring 3 and Ring 4. Prices start at $599, plus a $5.99 monthly subscription.

• Body measures 6.09 x 2.28mm versus 7.9 x 2.88mm on Ring 4, from 2g
• Battery rated 6-9 days; a size 9 lasted about eight days
• Starts at $599 for Silver and Black, other finishes cost $749
• Membership for detailed insights is $5.99/month or $69.99/year