Multifunction Health Smart Ring 21.5mm Sleep Tracking Blood Oxygen SpO2 Heart Rate Monitor Bluetooth Activity Tracker 1. Multifunctional Smart Ring, Blood Oxygen Monitoring; Heart Rate Monitoring; Sleep Monitoring; Step Counting; 10-Day Long Battery Life; Light And To Wear; Ip68 Waterproof; Camera Control; Multi-Sport Mode<br> 2. Thin And Comfortable To Wear<br> 3. New Smart Ring, On The Ring, All-Weather Intelligent Monitoring, Integrating Health Into Your , Multi-Dimensional Health Monitoring, Life Is Endless, Exploration Is Endless<br> 4. Ultra-Low Power Consumption, Longer Lasting, And Smoother Use. The Ring Chip Uses German Dialog DA14531 To Bring You Excellent Performance And Efficient Smart Experience. The Smart Ring Injects A Powerful Core To Make Every Interaction Smoother.<br> 5. Faster Charging And Longer Battery Life. It Uses A 17.5mAh Capacity Polymer Battery And Can Be Fully Once With The Charging Compartment. It Can Stand By For About 60 Days, Which Greatly Improves The Battery Life Of The Ring.<br> 1. Size: Inner Diameter Approximately 21.5mm<br> 2. Main Chip Model: German Dialog DA14531; Ultra-Low Power Consumption, More<br> 3. Body Storage Capacity (ROM + RAM): 128KB ROM + 96 KB RAM<br> 4.Battery Type: Polymer Pure Cobalt Battery<br> 5. Working Temperature: 0~50<br> 6. Charging Time: 2 Hours<br> 7.Theoretical Standby Time: 10 Days-15 Days<br> 8.Usage Time: -9 Days<br> 9. Operation Definition: The Ring Has No Touch Or Buttons; The App Initiates Exercise And Functional Testing<br> Note:<br> Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use<br> Colour:Silver<br> Material:Stainless Steel<br> Package Contents:<br> 1x Smart Ring<br> 1x Charging Cable<br> 1x Charging Compartment<br> 1x English Manual<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.