Rfid Mifare Reader Writer pcb board TTL RS232 Interface YHY522, support HF 14443 A card, 3.3V , ... change, so please check our Aliexpress store Mifare Rfid Board TTL RS232 Interface YHY522Specification:l Complete Read/Write module with built ... MHzl Supports ISO14443A /MIFARE® ,Mifare® Classic1K,Mifare® Classic 4Kl RS232(TTL) Interface, baud rate up to 230400bpsl Fast data transfer Contactless ...