Comprehensive Health DataRecord steps, sleep quality, heart rate, exercise data, and monitor blood pressure and blood oxygen levels Long-lasting BatteryEnjoy 5-7 days of active use or up to 15 days on standby with a quick 1-hour charging time Durable ConstructionCrafted from high-quality stainless steel for durability and a sleek appearance Water-ResistantIP68 waterproof rating allows for worry-free use during hand washing and in wet conditions Multi-Sport ModesSupport for various exercise modes to track your fitness activities accurately Specifications: Ring size: #8: Inner Diameter 18.1mm, #9: Inner Diameter 18.9mm, #10: Inner Diameter 19.8mm, #11: Inner Diameter 20.6mm Chipset: RF03 Compatible System: Android 5.1 (inclusive) and above, IOS 8.0 (inclusive) and above FLASH memory: ROM 512KB Screen size: no Resolution ratio: no Encoder: not support Touch type: not support BT: 5.0 low-power Bluetooth chip Bluetooth call: not support WIFI: not support NFC: not support Acceleration sensor: Sitronix STK8321 Gyroscope: not support Heart rate: Vcare VC30F GPS: not support Battery type: polymer lithium ion Ring Battery Capacity: 17mAh Charging Case Battery Capacity: 200mAh Charging method: magnetic charging APP: QRing Function: Step count, sleep, heart rate, exercise data recording, health monitoring, blood pressure, blood oxygen measurement, multiple sports modes, photo taking Support 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 Waterproof level: IP68 Charging time: about 1 hour Battery life: 5-7 days of use, 15 days of standby Appearance material: stainless steel Package included: 1 x Smart Ring 1 x Charging Cable 1 x Charging Case 1 x English User Manual