S9Q USB 2.0 To RS232 Serial DB9 9 Pin Male Adapter Extension cable For Laptop PC Converts a standard 9-pin serial port to USB&lt; Fully compliant with USB 1.1 / 2.0 Supports RS232 Serial Interface (standard 9-pin serial) Supports Windows XP, Vista & 7 (32-bit); Mac OS 8.6 or higher & OS X S9Q USB 2.0 To RS232 Serial DB9 9 Pin Male Adapter Extension cable For Laptop PC