R03 Sleep Tracker Blood Oxygen Heart Rate Monitor Multifunction Smart Ring with Charging Case - Black or Size 8 Advanced Health Monitoring¡¿Track sleep,heart rate,blood oxygen levels,and stress with precision using the R03 smart ring Long-lasting Battery¡¿Enjoy 5-7 days of active use or up to 15 days on standby with a quick 1-hour magnetic charging time Waterproof Design¡¿5ATM water resistance rating allows for worry-free use during swimming and other water activities Multi-Sport Modes¡¿Track various exercises and capture photos,all controllable through the QRing app Wide Compatibility¡¿Works with Android 5.1and and iOS 8.0and,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