Waterproof Material & Size : The NFC tag is made of environmentally friendly PET. Waterproof, smooth surface, wear -resistant and shiny. Size: 10 x 20mm, Thickness: 0.15mm, ultra -thin. NTAG213 Chip: Transparent NFC tags embedded in NTAG213 chip, working Frequency: 13.56 MHz, 137 bytes memory. High scanning intensity, working distance is 0-10cm, depending upon the reader configuration. Valid period: 10 years, 100,000 times. Features: Ntag213 chip have read write locking functions, which can be repeatedly edited or only read. Set to be edited or reset after reading only labels. You can use them to quickly share your social information, music, connecting wifi, establishing smart homes, business information sharing and more. Compatibility: Writable and programmable NFC 213 Tags compatible with all NFC-Enabled smartphones and devices. iOS system: iOS phone's NFC function commonly is used by Shortcuts App. Android system: All NFC tools app are perfectly to use on this system. Other NFC reader: All NFC tools app are perfectly to use. Applications: With self-adhesive backing, makes these NFC stickers can be used on different applications. (Note: Tags cannot be used on the metal surface and strong magnetic field).