Product information:
Color: black, white
Applicable people: general
Battery capacity: 50 mA
Additional functions: heart rate, blood oxygen, blood pressure, heart rate variability, sleep monitoring tracking, sleep body temperature, sleep analysis
Wearing method: finger wearing
Packing List: ring charging warehouse charging cable manual exquisite packaging

Size: Size 16: Internal strength 15.4mm
No.18: Inner strength 17.8mm
No.20: Inner strength 19.8mm