Different frequency RFID chips follow different communication protocols, so the tri-frequency card is also called RFID multi-protocol card, achieve identification, data storage, keys and other different purposes.
Chipu za RFID za masafa tofauti hufuata itifaki tofauti za mawasiliano, kwa hivyo kadi ya tri-frequency pia inaitwa RFID kadi ya itifaki nyingi, kufikia kitambulisho, kuhifadhi data, funguo na madhumuni mengine tofauti.