Smart Health Ring for Women Men Fitness Tracker with Heart Rate, Blood Oxygen, Blood Pressure, Sleep Monitoring, Step Counting, IP68 Waterproof for iPhone and Android, No Subscription Fee, Beige 9Size Before You BuyBefore purchasing the Milavan Smart Ring, we highly recommend referring to the size chart and measuring your finger circumference to ensure the most comfortable fit and avoid unnecessary returns or exchanges All Day Data MonitoringThe sleek designed ring features advanced 4. 0 sensor technology to continuously track multiple metrics, helping you better understand your daily status and optimize how you manage your routine Sleep