• 【Advanced Sleep Tracking】Precisely monitor your sleep patterns, heart rate, and blood oxygen levels with this smart ring design.
• 【Durable Construction】Crafted from 314 stainless steel with IP68 water resistance, suitable for long-term use in various environments.
• 【Long-lasting Battery Life】High-efficiency polymer lithium-ion battery offers 6-8 days of normal use or up to 15 days of standby time.
• 【Comprehensive Health Monitoring】Easily track multiple exercise modes, heart rate, sleep quality, and blood oxygen levels.
• 【Versatile Compatibility】Supports Android 5.1 and above, iOS 8.2 and above, with Bluetooth-compatible 5.3 connectivity for seamless integration.
• 【Lightweight Comfort】Weighing only around 3.2g with a thickness of 2.6mm, it's comfortable for all-day wear.

Specifications:

• CPU: AB2026B3
• Storage: 4Mb ROM + 96 Kb RAM
• Heart Rate Sensor: HX3918
• Battery Capacity: 18mAh
• Charging Method: Charging Case
• Charging Time: Less than 60 minutes
• Battery Life: 6-8 days (normal use), up to 15 days (standby)
• Water Resistance: IP68
• Weight: Approximately 3.2g
• Thickness: 2.6mm
• Operating Temperature: 0-50℃
• Bluetooth-compatible Version: 5.3
• Material: 314 Stainless steel with Potting Process
• App Name: Da Rings
• Features: Activity tracking, Sleep monitoring, Exercise records, Heart rate monitoring, Blood oxygen saturation, Heart rate variability, Stress monitoring, Female menstrual cycle tracking
• Size: 
• #8 (18.2mm)
• #9 (19.0mm)
• #10 (19.9mm)
• #11 (20.7mm)
• #12 (21.5mm)
• #13 (22.2mm)