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Item Type: Smart Health Ring Material: Aluminum alloy, stainless steel Weight: Approx. 75g/2.6oz Battery: 18mAhlithium ion battery (built in) Version: BT 5.1 Working Time: 3 to 5 days Charging Time: 0.5H Waterproof Level: IP68 Charger Requirement: Charged by 1A or below 1A charger APP: for Nx RING (Download from for Android or for iOS store or Scan the QR Code in the Manual) System Requirement: for Android: 6.0 or for iOS: 11.0 or higher Functions: Temperature detection, camera remote, multiple sports modes, sleep monitoring, step counter, data sync to APK APP, etc. How to Use: Remove the product and refer to the instructions for use PackageList: 1 x Smart Ring 1 x USB Cable 1 x User Manual