If you have ever slapped a travel card on a reader as you pass through the gates of a mass transit system you will know that radio-frequency identification (RFID) technology is increasingly ubiquitous.
While USB came from the PC world, it is not just a PC phenomenon. Cell phones, cameras, recorders, players, display devices, tuners, and more all use USB connectivity, either as a peripheral, or even as a host. Even picture frames have USB ports.
Of the many RFID technology variants, one of the most popular operates at 13.56 MHz and is known generically as HF-RFID.