USB "A" plug > 9 pin SUB-D plugTo connect serial devices to the USB-port Mini adaptor Suitable for devices with serial interface like modems, apparatus, toys, service interface e.g. for PBX and many more.- USB to seriall converter (COM)- prolific chipset- D-SUB 9 pin plug- USB 1.1 and USB 2.0 compatible- up to 1 Mbps data transfer- Windows 2000, XP, VISTA 7, 8, 8.1 compatible