The ACR1252u adheres to the standards of all NFC Forum documentation and supports the 3 modes of NFC communication out of the box: Read/Write Mode, Card Emulation Mode, Peer to Peer Mode. It also contains a SAM slot for .SDK. ACR1255U-J1 ACS Secure Bluetooth® NFC Reader is designed to facilitate on-the-go smart card and NFC applications. It combines the latest 13.56 MHz contactless technology with Bluetooth® connectivity. ACR1255U-J1 supports .