The Akyga® AK-CA-65 adapter is a high-quality power splitter that allows expansion of one existing 4-pin connector with three single 2x4-pin and 1x3-pin connectors, intended for connecting fans in computer enclosures to power supply or a controller.
Connecting the fans to the controller using this cable allows to control the rotation speed of PWM controlled fans. In addition, two of the connectors also allow to monitor the speed of the two fans. This reading shows the speed of the fastest spinning fan.