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basic parameters Ring size Internal diameter (mm) No. 18 17.8mm No. 20 19.8mm No. 22 21.8mm Weight: 4.7g Color: silver, black, gold Main functions: Step count, distance, calorie count Heart rate, blood oxygen saturation, body fatigue, sleep tracking APP: LuckRing Compatible system: Android 5.1 (inclusive) or above, IOS8.0 or above 5.3 Bluetooth Low Energy Chip Charging method: magnetic charging Supported languages: Danish, Ukrainian, Russian, Croatian, Hungarian, Hindi, Indonesian, Turkish, Hebrew, Greek, German, Italian, Latvian, Czech, Slovak, Slovenian, Japanese, French, Polish, Thai, Estonian, Swedish, Lithuanian, Simplified Chinese, Traditional Chinese, Romanian, English, Dutch, Portuguese, Spanish, Vietnamese, Arabic, Korean, Malay (with mobile phone system) Other parameters Waterproof grade: IP68 Charging time: about 1-2 hours Battery life: 5-7 days of use, 15-20 days of standby Appearance material: aluminum alloy, stainless steel