1、[Smart Health Ring] This smart ring allows you to check your sleep, body temperature, and more, allowing you to keep a close eye on your overall health anytime, anywhere. 2、[Fitness Companion] The smart ring health tracker can also serve as a fitness ring, tracking your daily step count, help you stay active and healthy. 3、[Aluminum Alloy Design] Crafted from aluminum alloy, this smart ring boasts an elegant and sturdy construction that is lightweight and comfortable to wear. 4、[Convenient Charging] Equipped with a charging case, this smart ring offers convenient charging, no need to worry about running out of battery when travel. 5、[Smoothly Design] With no charging port and smoothly interior, this smart ring offers a comfortable and seamless wearing experience with a stylish and modern touch. Item Type: Smart Ring Material: Aluminum Alloy, Electronic Components Ring Battery Type: Lithium Battery (Built in) Ring Battery Capacity: 20mAh Ring Battery Life: About 5 Days Ring Charging Time: 45 Minutes Charging Compartment Battery Type: Lithium Battery (Built in) Charging Compartment Battery Capacity: 350mAh Color: Silver Ring Number Applicable Finger CircumferenceInternal Diameter  No. 17 52.12mm / 2.05in 16.6mm / 0.65in No. 20 61.54mm / 2.42in 19.6mm / 0.77in No. 22 67.82mm / 2.67in 21.6mm / 0.85in 1 x Smart Ring 1 x Charging Cable 1 x Charging Case 1 x User Manual