This mini USB to RS-232 Plug-in Adapter is designed to make serial port expansion quick and simple. By connecting the unit to a USB port on your Tablet PC, notebook or PC, this USB-COM Plug-in adapter will instantly add RS-232 serial communication port to your system. The product is the smallest and most flexible USB to RS-232 Plug-in Adapter. The USB-COM-PL is featured with the biggest internal FIFO, 128 byte transmit and 384 byte receive FIFO, for high-speed data transfer rate. For more details on product, Please refer to http://www.papyrus.co.il/mini_usb_to_rs-232.htm