Features1. Appearance design: The outer ring is warm and smooth like jade, while the inner ring is tough and durable. The stainless steel shell and tens of thousands of CNC polishing processes are used to achieve ultimate durability, while the smooth inner shell is made of low allergenic epoxy resin, providing a high-quality touch from the surface to the inside.2. Sleep monitoring: When you fall asleep, the ring can automatically monitor your sleep quality and generate sleep reports, helping you develop good sleep habits.3. Blood oxygen persistence: Blood oxygen is one of the important indicators of human health, and the smart ring can accurately record your blood oxygen data.4. IP68 waterproof technology: Easily cope with daily waterproofing, support wearing for swimming, washing hands, rain, etc., to meet your various waterproof needs.5. Real time monitoring data: The QRing app needs to be connected to the ring via Bluetooth on the phone, keeping Bluetooth on. When the app starts, Bluetooth will automatically connect. When not connected to the phone, the ring can also independently perform body monitoring, record blood oxygen and heart rate status, and update data in the APP after connection.SpecificationMain functions: step count, distance, calorie calculation, heart rate, blood oxygen saturation, blood pressure, sleep tracking.Waterproof grade: IP68Charging time: approximately 1 hourBattery life: 5-7 days of use, standby for 15 daysAppearance material: stainless steelAcceleration sensor: Sichuang STK8321Heart rate: Vcare VC30FBattery type: polymer lithium-ionCapacity: 17nAhCharging method: magnetic suction chargingMaterial: Stainless steelStyle: No.8 18.1mm, No.9 18.9, No.10 19.8mm, No.11 20.6mm Color: Black, GoldSize: 1 x 1 x 1 cmWeight: 70 gPackage Include:1x Smart Rings