One of these already comes standard with a new reel of RGB LED Strip Tape. It is used to connect to the RGB Controller (which must be ordered separately). Additionally, each reel of RGB Strip Tape comes with a second set of lead wires at the opposite end. So if the reel is cut in to two separate sections, this 4-Pin Connector may be spliced to the lead wires (of cut section of Strip Tape) and attached to another controller. Or it can also be plugged in to a 4-Pin Y-Connector to run two legs of Strip Tape off the same controller.