Used Oura ring including ring charger, USB-C Charging Cable, and box. Oura ring has scuff marks commensurate with normal use. Works perfectly, selling because I switched out for a different color. Size: US 7 Color: Silver Horizon Generation 3 Oura is your personalized health tool — packing sleep insights, heart rate monitoring, activity tracking, illness monitoring, women’s health, and more into a single (and stylish) wearable. The Oura Ring uses advanced sensor technology to deliver personalized sleep and health insights straight from the most reliable source: your body. Oura is designed to provide accurate insights without disrupting your life. With precise sensors, Oura packs state-of-the-art heart rate, heart rate variability (HRV), temperature, activity, and sleep monitoring technology into a lightweight, non-invasive ring.