Adds dual serial port via USB connection. Easy serial port expansion with plug&play. Requires no IRQ, DMA, I/O port. Eliminates IRQ conflict and reserves system resourses Instaled as standart Windows Com port Compatible with new & legacy RS-232 devices Serial port speed up to 230K bps Full RS-232 modem control signals RS-232 data signals:TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND RS-232 Connectors: two DB9 male connectors Serial port is individually configurable Adds more ports conveniently as needs grow Bus-powered. No external power supply neededDriver CD for WIN XP/ME/2000 and 98!LOWEST PRICE ANYWHERE (all competitor units start @ $80.00)ONE YEAR WARRANTY!