SPECIFICATIONSActivity Tracked: Activity Tracker,Steps Tracker,Distance Tracker,Calorie TrackerBrand Name: NONECase Material: STEELCertification: ceDisplay screen: NoFunction: Health MonitoringHigh-concerned chemical: noneMaterial: STEELMetrics measured: Heart Rate Monitor,Blood Pressure Monitor,Sleep Monitor,Blood Oxygen Monitor,Stress MonitorModel Number: R09NFC Support: NoOrigin: Mainland ChinaWaterproof Grade: 5ATMWaterproof Grade 5ATMDive into water activities without worry, thanks to the 5ATM waterproof rating, perfect for swimming and water sports.Health MonitoringTrack your fitness with ease using the Smart Ring's heart rate and blood pressure monitor, ensuring you stay on top of your health.Bluetooth Call FunctionStay connected on the go with the Bluetooth call feature, allowing you to answer calls directly from your ring.Fitness TrackerMonitor your activities with the built-in activity tracker, helping you achieve your fitness goals effortlessly.Steel MaterialCrafted from durable steel, this smart ring offers longevity and robustness, designed to withstand daily wear.