The NFC ring can be used to unlock doors and mobile phones and will cost between 20 and 600 pounds. It works with various third-party apps to unlock your phone with a tap of the ring. Built into the ring are two tiny transmitters - one for public information and one for private. It can start the sharing of information over Wi-Fi, and can also be used to start apps with custom settings. The software the ring operates on is also open-source, so software engineers can create their own programs and tweak the software however they want it.