Sunlink Smart Ring - IP68 Waterproof Heart Rate Blood Oxygen

Specification: Name: Smart Ring Material: Titanium Steel Battery capacity: 18mAh polymer lithium battery Usage time: 3-7 days Waterproof level: IP68 Main functions [Monitoring]: Steps, distance, calorie calculation, sleep tracking, accurate date, heart rate, blood itch saturation, smart photography APP voice: multi-language Size: 10#19.8mm Color: silver/gold Packing included: 1 * Smart Ring 1 * Charging Cable Note: 1.Due to manual measurements and slight color variations, please allow 1-3 cm (0.4-1.18 inches) difference to suit different display settings. 2.Due to the light and screen difference, the item's color may be slightly different from the pictures.Please understand.