What do you mean by switchable? And what do you mean by switch? Just making sure there are no misunderstandings here...
I just mean each fan has an led that can be switched on and off. They have a small connector (I believe it is 2-pins) that can be connected to a switch on the case.
PS They are the CM Storm Force 200mm fans. I guess I'm just looking for some kind of 3-way y-connector or something?