Motherboard Serial Port - Internal - 2 Port - Bus Powered - FTDI USB to Serial Adapter - USB to RS232 Adapter Direct connection from the motherboard header allows for a clean and completely contained setup without taking up a PCI/PCI-Express slot in your system Standard and low profile/half-height bracket included to ensure fitment in any system Extensive list of OS support and Microsoft WHQL certified drivers makes for maximum compatibility and simple installation Single chip USB to asynchronous serial data transfer interface Supports COM port retention Bus Powered - no separate power supply or battery required FIFO receive and transmit buffers for high data throughput. Synchronous and asynchronous bit bang interface options with RD# and WR# strobes