This adapter cable allows you the ability to connect fans with 2-pin fan connectors to standard 3-pin and 4-pin PC fan headers. This cable is intended to be used with 2-pin fans that utilize the 2.54mm pitch KF2510 2-pin connector. Note that this connector is in the same series as your standard 3-pin and 4-pin PC fans. This cable does not alter the wiring of the connectors, pin 1 is ground and pin 2 is +V.