Yunir Smart Ring - 8#

Specification: Item Type: Smart Ring Material: stainless steel, EP Battery Type: Lithium Battery Battery capacity: 20 mAh (included) Battery life: approx. 5 days Charging time: approx. 30 minutes Thickness: approx. 2.5mm/0.1 inch APPLICATION: For Smart Health How to use: Thread the needle with thin thread for sewing clothes, measure the position of the wearing rings (the base of the finger). Use a ruler to measure the length of the thread (pull the thread straight, align the stitches on both sides) and be sure to measure slightly tight, otherwise it will be too large. Packing List: 1 x ring. 1 x charging cable. 1 x user manual (English language not guaranteed). Notice: When using it, make sure the optical sensor is close to the skin of the fingertip to ensure accurate data.