Catch WINAPI messages from external device

Hello.
I have small external device, it is LogiLink Video Grabber in this case ( connected via USB ). It have big single button (physical) and I trying to detect when somebody pressed it.
I tryied to use Window WndProc but this method not catch any kind of that messages.
So I tryed use Application.AddMessageFilter(*) but there is this same problem.
I'm guessing that I need to register for messages from this devices? Or something? Somebody have any idea how I can do this?
C# 2.0 / 3.5 / 4.0 it does not matter in this case.

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Ofkorse i cann't find any public API for this device.