... with USB interface.YHY632AR is 13.56MHz ISO 14443A desktop reader and writer, with RS232 interface.YHY638 AU ,YHY638FU is 13.56MHz ... ,VC& Delphi - demo program and source code)Demo program - show how to read and write data from the tagsource code - speed up software development ... input and output interface, usefule for end user to operate mifare cards,the program will record the id,string code,time ...