... Detailed Product Description Can built-in RFID Reader with 2.4G RFID tag, SD card record (optional),Two- way conversation, can connect ... : 1.Can built-in RFID Reader with 2.4G RFID tag, SD card record (optional) 2.Can connect external RFID Reader, Cameras, Printer ... /O port2 analog input ports, 6 digital input ports(2 positive input, 4 negative input), 3 digital output ports, 4 serial ports and ...