UniFi® Access Card is a highly secure NFC smart card compatible with the UniFi Access system. The card data is encrypted with both AES-128 and with UniFi Access proprietary security mechanism. These additional security measures protect the card number from leaks and duplication. Features: Secure NFC card for use with UniFi Access solution Each pack includes 20 UA-Cards UA-Card Dimensions 85.6 x 53.98 x 0.84 mm (3.37 x 2.13 x 0.033') Weight 5 g (0.18 oz) Format ISO 7810 ID-1 NFC Frequency 13.56 MHz Technology ISO/IEC 14443 Type A MIFARE DESFire EV2 UniFi Access Proprietary Security Protocol