The USB to serial adapter dongle is a more compact version of the USB to serial cable, it can be connected to the USB cable provided so it can either be used as a dongle or as a cable. It is very useful if you have serial devices and only one or no serial ports at all, in the case of most laptops now. All necessary drivers are supplied along with a USB cable. Features: USB 2.0 compliant Compact dongle style design RS232 Serial interface (DB9) Includes USB cable for convenience 1Mbps data transfer rate Supports remote wake up and power management Suitable for a wide range of serial devices Including PDAs, Modems, Data Cables etc. CE Certified Connectors: 1 x USB Type A Male, 1 x Serial DB9 Male Supported Operating Systems: Windows Vista Windows XP Windows 2000 Windows ME Windows 98 SE Mac OS V8.6 OR higher