Old revisions Add to book Export to PDF Fold/unfold all Book Creator Add this page to your book Book Creator Remove this page from your book Manage book (0 page(s)) Help HF(High Frequency) Card An electronic card that operates in the 13.56 MHz band and is capable of both reading and writing data. An HF card can be fitted with various security functions, such as data encryption and allowing it to be read by a specific reader only. See Also LF(Low Frequency) Card