Features: Multifunctional display screen data is clear, making it easy to view current time, step, heart rate, and sleep time without frequently taking out your phone or watch, making time management more convenient. 5ATM+IP68 deep waterproof, ensuring its normal operation whether washing hands, showering, swimming, or diving. Touch button, 24hrs 7d intelligent monitoring, multiple exercise modes, integrate health into your life, and visualize data. High end chip, low power consumption, excellent performances and long battery service life. Intelligent control is available at your fingertips through simple gesture control, making it easy to achieve the function of taking photos on your phone. With charging cable and charging box, easy to charge. Specifications: Material: Stainless steel+epoxy resin Color: Black Size: 8, 9, 10, 11, 12, 13 (optional) Battery capacity: 15~20mAh Charging time: about 1hr Working hours: 3-4 days Waterproof level: 5ATM+IP68 Connection method: Low power Bluetooth-compatible 5.3 Charging method: Charging through the charging compartment Rings width: 8mm APP: JRING support 20 languages Size:8 Diameter:1.81cm(0.71inch) Finger Circumference:5.69cm(2.24inch) Reference Weight:55-60kg Size:9 Diameter:1.89cm(0.74inch) Finger Circumference:5.96cm(2.35inch) Reference Weight:65-70kg Size:10 Diameter:1.98cm(0.78inch) Finger Circumference:6.06cm(2.39inch) Reference Weight:70-75kg Size:11 Diameter:2.06cm(0.81inch) Finger Circumference:6.46cm(2.54inch) Reference Weight:75-80kg Size:12 Diameter:2.14cm(0.84inch) Finger Circumference:6.72cm(2.65inch) Reference Weight:85-90kg Size:13 Diameter:2.22cm(0.87inch) Finger Circumference:6.975cm(2.75inch) Reference Weight:95-100kg Package Includes: 1 Piece Intelligent Rings(1pc, not multiple) note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.