Add a USB (Universal Serial Bus)-based RS232 Serial port to your laptop through an Express Card slot. The EC1S232U2 Express Card RS232 Serial Adapter Card (USB (Universal Serial Bus)-based) (16950 UART) adds an RS232 (DB9) serial port to your Express Card-equipped laptop, enabling you to connect an RS232 serial peripheral device such as a plotter, digital signage device, receipt printer or bar code scanner through an available Express Card slot. This USB (Universal Serial Bus)-based Express Card supports RS232 serial data transfer rates up to 460 Kbps & eliminates the need to upgrade serial peripherals to more modern interfaces (e.g. USB (Universal Serial Bus), etc.) for the sake of host compatibility, saving both expense & hassle.