ciciglow Smart Ring - 7#

Specifications: Item Type: Smart Ring Material: stainless steel, EP Battery Type: Lithium Battery Battery capacity: 20mAh (included) Battery life: approx. 5 days Charging time: approx. 30 minutes Thickness: approx. 2.5mm/0.1inch APP: For Smart Health How to use: Thread the needle with fine thread to sew clothes, measure the position of the wear 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 make sure to measure slightly tight, otherwise it will be too large. Packing List: 1 x Ring 1 x charging cable. 1 x User Manual Notice: When wearing it, make sure the optical sensor is close to the fingertip skin to ensure accurate data.