R12M smart ring heart rate oximeter step sleep monitoring

Product information:
Colors: Black No. 18, Black No. 20, Black No. 22, Silver No. 18, Silver No. 20, Silver No. 22, Gold No. 18, Gold No. 20, Gold No. 22
Battery Capacity: 15 mAh
Additional Features: Heart rate monitoring, blood oxygen monitoring, step counting, calorie tracking, sleep monitoring, pedometer
Wearing Style: Wearable