These keyfobs has a inserted NFC chip with epoxy shell which is anti-dust, waterproof.This RFID solution used for people, pet, bag etc, with NFC Ntag213,215,216 chip inside. It can be printed unique QR code and serial number. The QR code url is the same with the chip url.When the pets is lost,people with NFC phone can read the NFC chip to open the url then can get the rescue or contact/owner information.