Koepel:
They wrote "module for arduino" probably because that is used a lot. It could be an advertising trick.Go here: http://www.drexprojects.com/modules.html...
Great! Thank a lot! That is the info I looked 
Yes, indeed now I am secure, that this "module for Arduino" is a pure selling trick
Yes as well, the cost ist very low, but not as high as a good Cappuccino Cup, at least not in DE 
These selling tricks from China I know more and more. Not only with "For Arduino", many other tricks as well.