BRAND NEW AND SEALED IN ORIGINAL PACKAGING. OUTER BOX SLIGHTLY TATTY AND DISCOLOURED.\nAbout this product\n\n--Insights into over 30 biometrics\n--Up to 8 days of battery life\n--Water resistant up to 100m\n\nIntroducing Oura Ring 4: the latest evolution of the revolutionary smart ring. Oura Ring 4 brings you closer to what matters most \u2014 your health. The updated all-titanium design is powered by Smart Sensing, a new sensing platform that doesn\u2019t just measure your biometrics, it adapts to you, providing insights into over 30 biometrics including sleep, readiness, activity, heart health, stress and women\u2019s health. Oura Ring quietly and comfortably monitors your health, and with up to 8 days of battery life \u2014 you can forget it\u2019s even on.\n\nSleeker, smarter and more accurate than ever, Oura Ring 4 is made for you.\n\nAccuracy with smart sensing\nOura Ring 4 is powered by Smart Sensing, which adapts to your unique finger and activity \u2014 delivering accurate, .