Latest questions about "a4tech"

I have an A4Tech PC webcam but I do not know if it is model H or model K. How can I detect which camera I have on my PC? It is working but it appears as if I have both drivers.

My A4TECH 16M PK- 750G Internet camera can shoot pictures but not video. When I press the shoot button, nothing happens and when I try to see those videos, there is nothing.