MIFARE Utrlight-C 13.56MHz Hotel RFID Keyfob is made of ABS material with rfid chip and antenna . It will be durable and injection ABS case then sealing rfid chip under ultrasonic machine without any space sideview so that you can use them in out-door harsh environment and waterproof .It will fully ISO/IEC14443A 1-3 compliant and 13.56MHz NXP MIFARE Ultralight® C rfid chip .this kind of chip is the first smart card IC for limited-use applications that offers solution developers and prociders the benefits of an open cryptography. With 3DES authentication for data access protected and widely uses for transportation or hotel security keytag or e-tickets applications .