Each fan kit comes with a fan, adapter and splitter. The splitter allows for up to three fans to be linked to the Hydra. For the Hydra the kit can be plugged into the Fan port to allow the external fans to cycle at the same time as the built-in fan, or you can also plug the fans into the port marked DC power which will allow the fans to operate continuously. For the Cigar Oasis you need an extra ribbon cable and both cables must be plugged into the Oasis power port.