StarTech.com USB to Serial RS232 Adapter - DB9 - USB Serial Adapter - Prolific USB to Serial Adapter - 1-Port 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 Straight-Through RS232 Serial Adapter No external power needed - draws power from the USB connection 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 Straight-Through RS232 Serial Adapter Easy to setup and install No external power needed - draws power from the USB connection Thin cables and light weight makes it portable and easy to carry Supports serial data transfer rates of up to 1 Mbits/sec