High Security Level DESFire EV3 2K 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 ISO14443A and 13.56Mhz . DESFire EV1 or EV2 or newly EV3 version chip can have optional memory and 2K , 4K ,8K for using usual and they are all level of security using a 3DES or AES hardware cryptographic engine forenciphering transmission data ,it will greatly protect you data or money safe and hard to clone with another keyfob . they are widely using for cashless payment ,luxury items identification ,etc.