Feature:1. Lightweight Design: This fitness tracker ring features a lightweight design, with a super lightweight body (the ring is only about 5g), a non wearable, thin and light wearing experience, so light that you might forget it's there.2. Multifunctional: The smart ring has a variety of functions, which can monitor your sleep, body temperature, step logging and many other physical health data at any time, so that you can always observe your physical health.3. Exquisite Appearance: This smart ring health tracker has an exquisite appearance, which is very fashionable and good looking, and can add decoration to your hand.4. Excellent Aluminum Alloy Material: This fitness monitor ring is made of excellent quality premium aluminum alloy material, which is sturdy and wear resistant, not easy to be damaged, and has a long service life.5. Wide Application: This fitness sleep tracking ring has a wide range of applications and can be used at home, for sleeping, exercising, running and more.Specification:Item Type: Smart Ring Material: Aluminum Alloy, Electronic ComponentsRing Battery Type: Lithium Battery (Shipped With Built In Battery)Ring Battery Capacity: 17mahRing Battery Life: Approx. 5-7 Days Ring Charging Time: Approx. 45 Minutes.Package List:1 x Smart Ring1 x Charging Cable1 x Manual