Use this premium cable to attach virtually any existing external modem with a DB25 serial port to your computer. Constructed of molded strain relief to ensure a lifetime of error-free data transfer. It features oversized ergonomic thumbscrews that make installation a breeze. Cable Type: Modem; Connector / Port / Interface: DB 25 Male; DB 9 Female; for Device Type: External Modem; PC; Connects Devices (From / To): PC to External Modem.