USB to RS232 (9-pin) Cable w/25-pin Serial Adapter NEW USB Specification Revision 1.1 &amp; 2.0 Compliant. USB to RS232 cable with external adapter Support the RS232 Serial Interface (DB25 or DB9). Support 56k modems. Support remote wake-up and power management Suitable for PDA and Modem. Windows and MacOS Supported Systems Compatibility: Pentium 233 MMX or above, 64 MB RAM above, Windows 98 /ME /2000 /XP, &amp; MAC OS 8.5 above, Available USB Port Package content: 1 x USB to RS232 cable, 1 x external adapter, 1 x CD driver