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 its functionality. Safe Material: The round NFC card has a diameter of 25 mm, is small and compact, with a surface made of durable PVC material that is waterproof and stable. The back features 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 Mifare and all NFC-enabled Android phones and other devices. Suitable for uses such as outdoor mobile phones, 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, or control smart devices to enhance daily convenience. Color: White Material: PVC Package Contents: 1 set NFC tag Only the above package content; other products are not included. Note: Lighting effects and different displays may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement error allowance is +/- 1-3 cm.