brand new and high quality Feature: The smart ring is a fashionable and wearable electronic product with NFC chips. It`s able to connect to a smart phone to complete function performing and data sharing, that way many playful and convenient function will be accessible Place the smart ring within the NFC area of a smartphone to perform: screen unlocking, app lock unlocking, app quickly launching, name card and URL information sending and reading, etc. Designed with IP68 Water-proof level , you can wear it in all scene such as hiking, running and even swimming, but it`s supposed to be wiped dry to avoid the residual moisture in the ring soak your finger skin for long hour. It can be used without any power supply, very convenient. Main Functions: Application Quick-Start : with start-up command written in the smart ring, when the smart ring touches the phone the apps will automatically start. Quick-Unlock : hand wear ring touch unlock, screen lock, application lock set (some phones need to ROOT, can use the function). Program Lock & Ulock : select the application you want to lock / unlock, write the smart ring then touch the phone to start the application, to protect personal privacy. Information Sharing : you can store private content in the ring, you can also share the phone business card, wifi password, graphic information, etc., can also be used as a private memo to unlock the only way to unlock. Specifications: Proauct name: NFC Smart Ring Material: Stainless steel Size: 8/9/10/11 Package Include: 1x NFC Smart Ring Note Please allow 2-3 cm difference due to manual measurement. Besides different computers display colors differently, the color of the actual item may vary slightly from the below images, thanks for your understanding(1 inch = 2.54 cm)