Add a USB-based RS232 Serial port to your laptop through an Express Card slot. The EC1S232U2 Express Card RS232 Serial Adapter Card (USB-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-based Express Card supports RS232 serial data transfer rates up to 460 Kbps and eliminates the need to upgrade serial peripherals to more modern interfaces (e. g. USB, etc.) for the sake of host compatibility, saving both expense and hassle.