Communication with my smartphone ran smoothly and the dongle lies also with my Bluetooth headset link. I wanted to use the headset for listening to music, but unfortunately that the working poor and largely meaningless Microsoft Bluetooth stack (standard Bluetooth driver from Windows) was not possible. Search after hours of tinkering and numerous solutions from the Internet I finally found the 20 expensive software BlueSoleil which the only fulfilling my request said. Because of the description ("You can also use Bluetooth headsets for the PC.") I've assumed that I need any additional software to operate a headset under WindowsXP.
For the Bluetooth Dongle I forgive a total of just 3 stars because the Bluetooth dongle does its job without any problems. Point deduction due to the absence of evidence that additional software is required to operate a headset on Windows XP. A mini-CD with drivers alternative would have been good for this purpose.