Smart Ring Blood Oxygen Sleep Tracking Heart Rate

Product information:
Color: Black no.8mm, no. Black 9mm, black 10 mm,no. Black 11, Black 12mm, Black 13mm, gold 8mm, gold 9mm, gold 10mm, Gold 11mm, gold 12mm, gold 13mm, silver 8mm, silver no.9mm, silver no.10mm, silver no.11mm, silver no.12mm, silver no.13 mm
Battery capacity: 14mAh
Additional features: steps, distance, and calories calculation
Wearing method: Wearing