Plyisty Smart Ring - Size 13

Specifications: Item Type: Smart Ring Material: stainless steel. Ring Battery Type: LI Battery, Capacity: 20mAh (Built-in) APP: For Smart Health How to use: Using the fine thread used for sewing, measure where the ring will be worn (i.e. the root of your finger). Use a ruler to measure the length of the thread (the thread should be straight and the stitches on both sides should be aligned). Measure slightly narrower or it will be too large. Packing List: 1 x Smart Ring 1 x user manual (English language not guaranteed). 1 x charging cable. > Note: Wear correctly: Wear the optical sensor tightly with your finger skin to ensure the accuracy of the data.