1. Smart Ring Monitor: This smart ring can monitor your health data such as sleep time and status, body temperature and steps, observe your physical condition at any time. 2. Durable Materials: This smart finger ring is made of excellent stainless steel and zirconia ceramic, with high hardness, corrosion resistance, easy cleaning and maintenance. 3. Lightweight Design: This finger ring monitor is compact and lightweight, ensuring comfortable wearing without any binding feeling, and can be used anytime, anywhere. 4. Battery Powered: This smart ring is powered by a lithium battery, equipped with 350mAh large capacity charging compartment, which can be charged and used at any time. 5. This smart fitness ring is beautiful and elegant, making it a meaningful gift suitable for birthday, anniversary, Thanksgiving, Christmas, or Valentine Day gift. Item Type: Smart Health Ring Material: Stainless Steel, Zirconia Ceramic, Electronic Components Ring Battery Type: Lithium Battery (Built in Battery) Ring Battery Capacity: 18mAh Ring Battery Life: About 3 to 5 Days Ring Charging Time: 45 Minutes Charging Case Battery Type: Lithium Battery (Built in Battery) Charging Case Battery Capacity: 350mAh Applicable size: Ring Number:Number 17, Applicable Finger Circumference:56mm 2.2in, American Size:Number 7 Ring Number:Number 18, Applicable Finger Circumference:60mm 2.36in, American Size:Number 8 Ring Number:Number 19, Applicable Finger Circumference:64mm 2.52in, American Size:Number 9 Ring Number:Number 20, Applicable Finger Circumference:69mm 2.72in, American Size:Number 10 Ring Number:Number 21, Applicable Finger Circumference:73mm 2.87in, American Size:Number 11 Ring Number:Number 22, Applicable Finger Circumference:75mm 2.95in, American Size:Number 12 How to Use: Before use, please scan the QR code to download the APP. Follow the user manual for operation. StartupDurable Materials: This smart finger ring is made of excellent stainless steel and zirconia ceramic, with high hardness, corrosion resistance, easy cleaning and maintenance. Perfect Gift: This smart fitness ring is beautiful and elegant, making it a meaningful gift suitable for birthday, anniversary, Thanksgiving, Christmas, or Valentine Day gift. Smart Ring Monitor: This smart ring can monitor your health data such as sleep time and status, body temperature and steps, observe your physical condition at any time. Lightweight Design: This finger ring monitor is compact and lightweight, ensuring comfortable wearing without any binding feeling, and can be used anytime, anywhere. Battery Powered: This smart ring is powered by a lithium battery, equipped with 350mAh large capacity charging compartment, which can be charged and used at any time.