Built-in high frequency chip. Waterpoof,Rewriteable. Support 13.56mhz RFID and NFC IC reader/writer, For example:Acr122u reader/writer Amiibo Compatible Support Smart mobile phones with NFC function. Application:Check in, mobile payment, product information query, mobile identification, mobile marketing, social networking, business card sharing, access control, membership management, posters, healthcare,book borrowing etc.