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NOTE:Dear customer, regarding the color of the charging compartment, black and white will be randomly shipped. Unable to specify color, random shipment, please be informed. Size: 7# = Inner diameter 17.4mm, 8# = Inner diameter 18.2mm, 9# = Inner diameter 19.0mm, 10# = Inner diameter 19.9mm, 11# = Inner diameter 20.7mm, 12# = Inner diameter 21.5mm Features: * High Quality: The stainless steel smart ring has a high strength to ensure the durability of the product, and it can easily cope with even daily bumps without damaging its elegant shape. With a high-strength and lightweight design, it brings lasting comfort and a premium experience of non-sense technology to the fingertips, allowing smart wearables to easily integrate into every moment of life. * Waterproof: The stainless steel smart ring is 5ATM waterproof, can be worn for diving or snorkeling, and supports waterproofing at a depth of more than 50 meters. * Innovative Design: Without directly touching the phone screen, you can operate tiktok, various videos, browse the web, etc. to a certain extent. * Protect Your Health: 24-hour health monitoring, with practical functions such as health monitoring (such as heart rate, blood oxygen, sleep monitoring), exercise tracking, etc., so that you can understand your own condition and obtain important information at any time. * Long Battery Life: Using 200MAH capacity polymer battery, with charging cable, it can standby for about 15 days after being fully charged, greatly improving the battery life of the ring. Specification: Name: Smart Ring Material: Stainless Steel Working temperature: 0-50℃ Charging method: Magnetic charging Compatibility: Compatible with Android 5.0 and above, compatible with Apple I0S10.0 and above Compatible software: JRing Inner diameter: 19mm Color: black,silver,gold Packing included: (as you choose) 1 * Smart Ring  Note: 1. Due to manual measurements and slight color variations, please allow 1-3 cm (0.4-1.18 inches) difference to suit different display settings. 2. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand.