StarTech.com USB to Serial Adapter - 2 Port - Bus Powered - USB To RS232 Adapter Cable - DB9 (9-Pin) USB Converter Add 2 serial RS-232 ports to any laptop or computer with a USB port 2 Port USB to RS232 Serial DB9 Adapter Cable / USB Serial Adapter / Usb Serial Converter USB to RS232 / USB to DB9 / 2Port USB to Serial RS232 Adapter / Serial Cable Adapter Simple installation and operation provides robust serial connectivity to legacy PCs Drawing power from the USB bus saves the hassle of carrying an external power adapter for this add-on serial port Extensive list of compatible operating systems makes this device perfect for almost any RS232 application USB to 2 Port Straight-Through RS232 Serial Adapter Easy Plug-and-Play installation Bus powered, no external power adapter required Fully compliant with USB 1.1 specifications