RF proximity card.
Allows automatic identification of the user by radio frequency, MF. Passive card, when in proximity to the reader is activated by magnetic induction. When activated (electromagnetic induction) it returns a code to the system so requires no battery.
Communicates with the reader via an RF antenna at 13.56MHz.
Manufactured in PVC and with a similar size to most credit cards so can be transported in most card wallets. Completely white on both sides so allows for printing on both faces.