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Hot Sale Stainless Steel NFC Bluetooth Smart Ring. Health Monitoring Focus: Specialized for sleep, heart rate, and discreet style tracking. Premium Material: Constructed with medical-grade stainless steel housing. Comprehensive Features: Includes SpO2, skin temp, optical HR, and contactless payment. Full OEM/ODM Support: Customize colors, materials, UI, and branding with flexible MOQ. Certified Quality: Manufactured in ISO-certified factories with CE, FCC, RoHS compliance. 12-Month Warranty: Ensures reliable quality and stable performance for business. Tiered Pricing: Lower unit prices for bulk orders with competitive offers. Fast Lead Time: 15-25 working days for standard models after deposit.