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 for automatic data entry into your phone. Note that it is not suitable for use in strong magnetic field environments or on metal surfaces, as this may affect performance. If it doesn't work, please . Safe Material: The round NFC card measures 25 mm in diameter, is made of PVC material, waterproof and stable, with a sticky back for easy attachment and storage. It is designed for long-term use. Data Storage: The chip has 504 bytes of memory, providing sufficient storage space, 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 uses such as outdoor mobile tags, electronic label shelves, smart advertising, and product authentication. Multifunctional: Use NFC stickers to share social information, electronic postcards, connect to Wi-Fi, launch apps, play music, and more to create a smarter lifestyle. Color: White Material: PVC Package Contents: 1 set NFC tag Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement allows an error of +/- 1-3 cm.