The HyperFan V2 Extension Cable gives you an extra 5m of length from a HyperFan to whatever it is connecting to. Many controllers do not come complete with cables in the box, so you need to get them separately.
This is because of the varying set ups growers use the controllers for. Sometimes you need a splitter or long distances between the appliances, which the manufacturer cannot predict. By making all cables available on their own, you can get what you need and have no spare cables laying around.
