Features: 1.Fashionable wearable electronic products that connect with mobile phones through nfc wireless radio frequency communication technology to operate mobile phone functions and share data. 2.Features a built-in nfc chip, no power supply, and high-grade waterproof performance. Quality stainless steel and titanium steel made, which is safe and durable. 3.By touching the nfc signal area of the mobile phone, functions such as screen unlocking, app lock, quick start of apps, sending and reading business cards, and website information can be realized. 4.Support NFC function smart fingerprint password lock, NFC smart attendance, need to match, write tag information or number synchronization can be used. 5.Note-When used with a mobile phone, the mobile phone needs to have its own nfc function and download the app to use it. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Material: stainless steel and titanium steel Size: As the picture shown Decoration form: wearing Color/Style: As the picture shown includes: 1 x NFC Smart Ring