Advanced Health MonitoringTrack sleep, heart rate, blood oxygen levels, and stress with precision using the R03 smart ring Long-lasting BatteryEnjoy 5-7 days of active use or up to 15 days on standby with a quick 1-hour magnetic charging time Waterproof Design5ATM water resistance rating allows for worry-free use during swimming and other water activities Multi-Sport ModesTrack various exercises and capture photos, all controllable through the QRing app Wide CompatibilityWorks with Android 5.1+ and iOS 8.0+, supporting over 30 languages for global use Specifications: Ring size: #7: Inner Diameter 17.9mm, #8: Inner Diameter 18.3mm, #9: Inner Diameter 19.2mm, #10: Inner Diameter 20mm, #11: Inner Diameter 20.9mm, #12: Inner Diameter 21.6mm Chipset: RF03 Compatible System: Android 5.1 (inclusive) and above, IOS 8.0 (inclusive) and above FLASH memory: RAM 208KB FLASH 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: 15mAh Charging Case Battery Capacity: 200mAh 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: 5ATM 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