... 1.USB to 4-port RS232 serial port converter Features:1.Computer interface: USB V1.1 2. ... driver.3.USB to 4-Port RS-232 serial Supports Windows 95/98/Me, 2000, 2003, XP, Vista,Win7, CE, Linux ,MAC.4 ... V2-,V2+ is only for power input backup) USB to serial converter/USB to 4-Port RS-232 Hub