The BM4K is a card access credential equipped with the MIFARE® DESFire® EV1 communication protocol. MIFARE® DESFire® technology supports AES encryption, ensuring that card cloning is a thing of the past. The technology within the BM4K card also allows for more than just the card's unique identifier to be carried on the card - additional information can be stored and used, such as payment information for vending machines. The standard credit card size of this credential makes it ideal for carrying in a lanyard or wallet.