Feature: 1. [Multi Functional] This smart ring offers a variety of functions, allowing you to monitor your sleep quality, body temperature, and more, providing real time insights into your overall health. 2. [Fitness Tracker] This health tracker ring also serves as a reliable fitness companion, accurately recording your daily steps and activity levels, helping you stay on top of your fitness goals. 3. [Stainless Steel Construction] Crafted with premium stainless steel, this smart ring is not only sturdy and long lasting but also adds an elegant and stylish touch to your overall look. 4. [Deep Waterproof] Designed to withstand various waterproof needs, this smart ring is deep waterproof, ensuring it can endure activities like swimming and more without any worries. 5. [Lightweight and Comfortable] With its lightweight design, this smart health ring offers a comfortable wearing experience. It feels so light that you might even forget you are wearing it. Specification: Item Type: Smart Ring Material: Stainless Steel, Electronic Components Ring Battery Type: Lithium Battery (Built in) Ring Battery Capacity: 18mAh Ring Battery Life: 3-5 Days Ring Charging Time: 60 Minutes Color: Purple Ring NumberRing Inner Diameter Applicable Finger Circumference No. 18 18.9mm/0.74in 59.5mm/2.34in No. 20 19.8mm/0.78in 62.1mm/2.44in No. 23 20.6mm/0.81in 64.6mm/2.54in . Package List: 1 x Smart Ring 1 x Charging Cable 1 x User Manual