Simplify the following text for a Grade 6 native English-speaking person.
Original: Contactless smart cards do not contain an ordinary read-only RFID , but they do contain a re-writable smart card microchip that can be transcribed via radio waves .
Simplified: Many people believe contactless smart cards have a read-only RFID inside it . This is not true , but they do have a re-writable smart card microchip inside them .