Ease of operation: Ensure the device supports NFC functionality. After installing the corresponding application, select "write" or "enter data," then place the NFC card close to the device's sensing area. The data will be automatically entered into your phone. Note that it is not suitable for use in strong magnetic field environments or on metal surfaces, as this may affect functionality. If issues occur, contact customer support. Safe Material: The round NFC card has a diameter of 25 mm, is compact and lightweight, and features a surface made of durable PVC material that is waterproof and stable. The back has an adhesive layer for easy attachment and storage, allowing for long-term use. Data Storage: The chip provides 504 bytes of storage space, offering sufficient capacity for your data, and includes a read/write lock function for secure information writing. Wide range of applications: NFC cards are compatible with Tag M and all NFC-enabled Android phones and other devices. Suitable for use in outdoor mobile phones, tags, electronic label shelves, smart advertising, product authentication, and more. Multifunctional: Use NFC stickers to share social information, electronic postcards, connect to Wi-Fi, launch apps, control smart devices, and more to enhance daily convenience. Color: White Material: PVC Package Contents: 1 set NFC tag Only the above package content is included; other items are not part of the package. Note: Lighting reflections and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement tolerances are +/- 1-3 cm.