?3 PIN AND 4 PIN COMPATIBLE? Each extension cable supports PWM function and speed regulation with a 4-pin female and 4-pin male port, which can also be used for 3-pin cpu fans. ?4 Pin Fan Extension Cable?Package Content:10-Pack. 30cm/12 inch extension cables. for PC computer atx case internal motherboard fans.If you need more length, the pwm fan cable extensions can be daisy chained together to meet your needs. ?Reliable Construction? Black sleeved nylon braided cable, more durable and make the inside of pc case looks more clean & tidy. ?Easy to Install ?Plug and play, easy to connect. Fan extension cable provides more flexibility between motherboard and CPU cooling fan. ?PWM Control Extension?Excellent 4 pin PWM fan power supply extension cable for PC computer motherboard fans, make you easier diy PC computer case.