Portable Multiple Modes Multi-Functional Activity Tracking Fitness OEM Bluetooth Smart Ring. Comprehensive Health Monitoring: Tracks heart rate, blood oxygen, sleep stages, stress, and body temperature automatically. Multiple Color Options: Available in Silver, Rose Gold, Gold, and Black to suit different preferences. Eight Size Variations: Fits sizes 6 through 13 with a consistent width of 2.8mm and thickness of 2.8mm. Long Battery Life: Up to 7 days of usage and 15 days of standby time on a single charge. Wireless Qi Charging: Conveniently charges via wireless case in under 2 hours. OEM & ODM Support: Full customization services available including design and sample production. Global Certifications: CE, ROHS, and FCC certified for international safety and compliance standards.