Amazon Hot Selling MF1k Contactless HF Printable 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 compliance with ISO14443A and 13.56MHz MF 1k byte memory chip .it has organized in 16 sectors with 4 blocks of 16 bytes each ( one block consists of 16 byte ) ,the mifare system offers real multi-application functionality comparable to the features of a processor keyfob ,Two diffeent keys for each sector support systems using key hierarchies.Also widely uses in door control access , school cantenn recharge keyfob ,etc .

Donut Shape FM11RF08 MF1K 13.56MHz HF 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. FM11RF08 ( normally call F08 for short ) is the contactless card IC according to ISO14443 Type A development by China Shanghai FuDan Microelectronics Co.,Ltd and 1Kx8 bits EEPROM organization .It can fully compatiable with MIFARE Classic 1K chip the only different will each sector has its own two secret files for systems using key hierarchies .

Plus S 2K 13.56MHz RFID Key Tag 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. The Plus is the only mainstream IC compatible with MF 1K and Mf 4K ,and it uses AES -128 ( advanced Encrption Standard ) for authentication , data integrity and encrption ,besides it available in two versions ,Plus S and  Plus X , both versions have 2kB or 4kB EEPROM as optional for you  .It is widely using for public transprtation , access management , electronic toll collection and loyalty programs