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Specification: Item type: smart ring. Material: aluminium alloy, stainless steel. Weight: approx. 75 g / 2.6 oz. Battery: 18 mAh lithium-ion battery (built-in) BT version: BT 5.1. Working time: 3 to 5 days. Charging time: 0.5 hours. Waterproof level: IP68. Charger Requirements: Charge with 1A or less charger App: for Nx Ring (download from the store for Android or iOS or scan the QR code in the manual). System Requirements: For Android: 6.0 or higher. For iOS: 11.0 or higher. Functions: temperature detection, camera remote control, multiple sports modes, sleep monitoring, pedometer, data synchronisation with the APK app, NFC, etc. Application: Remove the product and read the instructions for use. Package list: 1 x smart ring. 1 x USB cable. 1 x user manual (English language not guaranteed).