switches that control the speed (and noise) of the fans in ur case. u kud lower the settings if ur surfing the web, and put it to full blast when ur gaming. essential if u cant stand the noise of the fans.
ya, just go down to radio shack and pick up a couple switches (or if you really want it cool get some rheostats). Then just drill a hole in your exisisting flopy bay cover. Pretty simple mod, and its quite usefull