13.56MHz ISO15693 ICODE SLIX NFC 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 compliance with ISO15693 and 13.56Mhz NXP ICODE®SLIX chipset , an intelligent anticollision function enables several keyfobs to operate in the field simultaneourly.The anticollision algorithm selects each keyfob individually and ensures that the execution of a transaction with a selected keyfob is performed correctly without data corruption resulting from other keyfobs in the field .This kind of rfid chip keyfob widely uses for libraries .pharmaceutical supply chains and door control access, etc .It also is fully compatible with NFC forum type 5 under nowadays more and more popular NFC applications .