100% brand new and high quality Features: Update Health Material: R4 ring health index is fully upgraded It made of Micro crystalline Zirconium Ceramics, blended with Germanium Grail, Volcanic Magnet and fir energy stone, contributing a lot to wearer's health. Crystal ceramic has trace elements which can improve the human metabolism and effectively promote blood circulation; fir e energy stone can help people effectively resist the electromagnetic wave from computer ,phone or electrical appliance. Aesthetic and Wear-resistant: High-quality materials make it extremely hard. This ring has four times the hardness of the alloy, which makes it not worn out due to scratching in daily life. At the same time, it has excellent refractive index and dispersion performance, allowing the whole to emit a unique luster. Function Upgrade: The fourth-generation smart ring is equipped with multiple sets of RFID smart modules, which can simulate four non-contact sensor cards at the same time. In addition, the newly designed circuit structure greatly reduces the electric field interference between the modules. Compared with the previous generation, this product has increased the sending and receiving distance by 3 times. It can be easily compatible with various card reader devices. Waterproof Dust and Fall Proof: IP68 waterproof level, dust-proof and excellent resistance to fall and rolling resistance can be competent to the application requirements of any occasion. No need battery charging, make you forget the recharging and wiring harness, and use it at any time. Wide Compatibility: The NFC function has been redesigned. It supports almost all mobile phone applications on the market.Support phone models. Ring only, other accessories demo in the picture is not included! Specifications: Material: Microcrystalline Zirconium Ceramics Optional Size: A, B, C, D, E A Size: Inner Diameter Circumference: app.5.71cm/2.25in, Diameter: app.1.82cm/0.72in B Size: Inner Diameter Circumference: app.6cm/2.36in, Diameter: app.1.9cm/0.75in C Size: Inner Diameter Circumference: app.6.28cm/2.47in, Diameter: app.2cm/0.79in D Size: Inner Diameter Circumference: app.6.6cm/2.60in, Diameter: app.2.1cm/0.83in E Size: Inner Diameter Circumference: app.7cm/2.76in, Diameter: app.2.22cm/0.87in Color: As the pictures shown Quantity: 1 Pc Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x Ring