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. If it doesn't work, please . Safe Material: The round NFC card measures 25 mm in diameter, small and compact. The surface is made of durable PVC material, waterproof and stable. The back is adhesive for easy mounting and storage, allowing long-term use. Data Storage: The chip has 504 bytes of memory, providing sufficient storage space. It features a read/write lock function for secure and quick information writing. Wide range of applications: NFC cards are compatible with Tag M and all NFC-enabled Android phones and other devices. Suitable for 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, helping create a smarter lifestyle. Color: White Material: PVC Package Contents: 1 set NFC tag Only the above package content; 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.