An advanced smart ring from Cardial helps you track your health and daily activity in an easy and elegant way. A modern and lightweight design suitable for daily use. Features: • Heart rate measurement ❤ • Blood oxygen measurement (SpO2) • Sleep analysis and its stages 😴 • Step and calorie counting 🔥 • IP68 waterproof • Small screen displays time and information • Works with iPhone and Android • Battery lasts approximately 3 to 5 days • Fast magnetic charging Attachments: • The ring • Charging base • Charging cable The ring is suitable for sports and daily health tracking. Size 8 and this size is cut from the market