Features: The smart ring is a fashionable and wearable electronic product which is able to connect with a smartphone through Near Field Communication (NFC) to complete function performing and data sharing. Designed with high-level water resistance, it can be used without any power supply. Embedded with NFC chip, it can only be connected to a smartphone with NFC function. 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. Specification: Material:Titanium steel + NFC smart chip Color:Black Size: US Size6/7/8/9/10/11/12/13 Quantity:1Pc. Note: Please allow 1-2mm errors due to manual measurement. Due to the difference between different monitors, there are color differences, please take the real product as the standard. Package includes: 1 Pc NFC Smart Ring (other accessories demo in the picture is not included.)