Fangrui Product Details Ease Of Operation: Make Sure The Device Supports Nfc Functionality. After Installing The Corresponding Application, Write Or Enter Data, Put The Nfc Card Close To The Device Sensing Area, And The Data Be Automatically Entered Into Your Phone. Please Note That It Is Not Suitable For Use In Strong Magnetic Field Environments And On Metal Surfaces, Which Its Functionality. If It Doesnt Work, Please Contact Us. Safe Material: The Size Of The Round Nfc Card Is 25 Mm In Diameter, Small And , The Is Made Of Pvc Material, Waterproof And Stable, The Back Is Sticky For Easy Fixing And Storage Box, And It Can Be Used For A Long Time. Data Storage: The Chip Has 504 Bytes In Stock, Providing You With Enough Storage Space And Has A Read/write Lock Function To Quickly Write The Information You Want. Wide Range Of Applications: Nfc Cards Are Compatible With Tag Mo And All Nfc-enabled Android Phones And Other Devices. Outdoor Mobile Phones Support Tags, Electronic Label Shelves, Smart Advertising, Product Certification,