Specifications: PWM one-to-three connection cable, with length of 26cm. Protective fan interface. It is easy to realize the parallel connection of 4Pin PWM temperature control fans. It can take full advantage of the limited number of 4Pin interfaces on the motherboard, and can accept three 4PIN/3PIN fans. In order to avoid the signal conflict of simultaneous velocity measurement, two of them are missing the speed lines. Item Name: 4Pin Fan Extension Cable Material: PVC Features: Durable, 1-to-3 Design, 3Pin/4Pin Interface, Computer Accessories Length: 26cm(Approx.) Notes: Kindly notice the three interface has 1 for 4Pin and 2 for 3Pin. Only one interface will support the intelligent temperature control and speed measurement. Because even the same type of fan may have different rotational speeds, the motherboard will strike if two fans with different rotational speeds are measured simultaneously with a needle of the motherboard. The result is that all the PWM and speed measurement functions of the two interfaces are invalid. So it need to eliminate one of the speed measuring lines, as long as the working of one fan, other fans can also play the purpose of temperature control and speed regulation. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.   Package Includes: 1 x 4Pin Fan Extension Cable