Tripp Lite Keyspan High-Speed USB to Serial Adapter, PC & Mac (USA-19HS) Serial adapter allows a serial device to be connected to a USB computer Plug-and-play convenience:DB9 serial port is seen as a COM port by your computer, and is available for use by any program that accesses COM ports No need for an external power adapter:draws power directly from your computer via the USB connection DB9 serial port supports data transfer rates up to 230 Kbps:twice the speed of a standard built-in serial port LED shows adapter status and data activity at a glance