ciciglow Smart Ring - 13#

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. 2.5 mm / 0.1 inches. APP: For intelligent health. Application: Thread a fine thread into the needle for sewing clothes, measure the position of the carrying rings (the base from the finger). Use a ruler to measure the length of the thread (pull the thread straight, align the points on both sides) and make sure you measure the length a little firmer, otherwise it will be too big. Package list: 1 x ring. 1 x charging cable. 1 x user manual (English language not guaranteed). Note: When wearing, please make sure that the optical sensor is near the skin of the fingertip to ensure accurate data.