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This cable is useable to connect 4 aerators with 3 pin plug (CPU aerator, housing cooler etc.) directly to mainboard. With this special cable it is possible, to run an aerator with 5 Volts insted of 12 Volts, because most of the aerators have no seperate regulator. The voltage reduction causes a smooth running noise and has a share to noise reduction in the whole housing. Both of the other aerators run with 12 Volts regulary. Due to the lowered rotational speed of the aerator the air flow is also lower.