Lock and unlock your Smart phone or tablet quickly, hide the app when you leave your smart phone alone Share & Transfer information (send the private message/Picture/business card/ website link to the person you want to share by a simple touch) Control Applications (you can write a fixed process list ahead of the time, and the will start the applications each time by simply touch. Quickly start the phone application, in advance will need to quickly start the program startup written in the smart , when the smart touches the phone will automatically find and start the program. Multi-functional NFC smart , the main function is to store and exchange personal information, as well as mobile content and personal privacy encryption unlock, support for Apple, Samsung, Huawei, millet and other DNF-enabled mobile phone. Specification: Material: Metal Width: 8mm/0.31inch Diameter: 16mm/0.63inch Package Includes: 1 Piece NFC Smart (4 Pack)