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[Health Monitoring] Advanced sensors measure data every 30 minutes with real-time alerts for abnormal health metrics. [Long Battery Life] Low-power chip enables 3-5 days of use with just 1-2 hours of charging for uninterrupted tracking. [ Control] Remotely take photos or videos hands-free with app-supported commands. [50M Water proof] Suitable for swimming showering and outdoor activities with durable stainless steel design. [Activity Tracking] Automatically records running swimming steps distance speed and calories burned. Spec: Item Type: Smart Ring​ Fitness Tracker Material: Stainless Steel + Glue Filling Ring​ Battery Type: Li Battery, Ring​ Battery Capacity: 20mAh (with built in battery for shipment) Ring​ Battery Life: Approx. 7 days Ring​ Charging Time: Approx. 60 minutes APP: for LuckRing Package List: 1 x Smart Ring​ 1 x Ring​ Cover 1 x Instruction Manual 1 x Charging Cable How To Use: See user manual Note: Before purchasing, please pay attention to the size. We strongly recommend you to refer to the size chart and measure the circumference of your finger to ensure the most comfortable wearing effect, and avoid unnecessary returns or exchanges.