1) The webcam does not come with driver software and, unfortunately, without any hint of where her an appropriate Windows software would possibly relate to. The (positive) function test succeeded only under LINUX with an appropriate webcam program.
2) First, no audio signal was present. This was caused by the loose in the webcam around falling microphone. After the Micro had been pushed into the front slot before the corresponding hole and fixed with some glue, it went.
