ACR1255U-J1 Bluetooth NFC Reader, USB, LED and Buzzer. 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 .ACM1252U-Z2 is a small NFC reader module developed based on 13.56 MHz contactless .