The pwm fan splitter cable is designed with a 4-pin female connector on the one end and on the other end it splits into three 3-pin male & one 4-pin male connector, 1-to-4 splitter fan power supply extension cables, male to female connector plug.. The black sleeved case fan braided adapter cable is mostly compatible with many brands of 3-pin and 4-pin PC case motherboard cooling fans, this PWM fan splitter hub connects 4 computer case fans to a single motherboard fan header.. Easily realize 4 pin PWM temperature control fan parallel connection, make full use of the limited number of motherboard 4 pin interface, can be extended to connect three 3-pin male & one 4-pin male fans, the fan splitter cable provide additional fan to increase airflow in your computer case.