... after extension; 6. Have multiple interfaces, including Ethernet, USB, RS-232 serial port, cash drawer and etc. to ensure the extension ... Paper Model57.5 ± 0.5mm wide thermal paper Communication interfaces RS-232, optional:RJ-11, RJ-45, USBWireless CommunicationsZigBee,GPRS,CDMA, ... New Product CertificateSwipe cardStainless satin finished tray Multiple and single communication interface available