[Waterproof Material & Size]: The NFC tag is made of environmentally friendly PET. Waterproof, smooth surface, wear-resistant and shiny. Size: 21x11mm, Thickness: 0.15mm, ultra-thin. [NTAG213 Chip]: Transparent NFC tags embedded with NTAG213 chip, working frequency: 13.56 MHz, 144 bytes memory. High scanning sensitivity, working distance is 0-10cm, depending on reader configuration. Valid for 10 years, 100,000 write cycles. [Features]: NTAG213 chip has read and write locking functions, which can be set to read-only or rewritten. Can be locked or reset after reading. Ideal for sharing social information, music links, Wi-Fi connection, smart home automation, business information sharing and more. [Compatibility]: Writable and programmable NFC 213 tags compatible with all NFC-enabled smartphones and devices. (Note: Some models can only read data and cannot write.) [Applications]: With self-adhesive backing, these NFC stickers can be used in various applications. (Note: Tags cannot be used on metal surfaces or in strong magnetic fields.) Color: As Shown Material: PET Package Contents: 100 x NFC Tags 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 vary slightly from the real thing. Measurement may vary by +/- 1-3cm.