This adapter cable is designed to allow connecting conventional 4-pin PWM PC fans to the proprietary 4-pin fan header found on Dell and other OEM motherboards We advise the use of a fan which supports 4-pin PWM speed control, and for the possibility of BIOS fan alerts RoHS Compliant, the sleek all black construction of each cable features high density black PET sleeving Cable length (including connectors) is 6 inches (15cm)