ATX Dual PSU Cable Package includes:1 Pcs Dual PSU Power Cable. Length: 1ft/12 inch. ??Connect 2 Power Supply Units together to provide more power to your computer components without having to upgrade your existing Power supply unit. ??This is safe as the motherboard gets power from one PSU only. The second PSU provide power to other components. Both PSU start when the On / Off button of your PC is pressed. ? How to Use: Plug the 24(20+4)pin of the main power supply into the female plug and plug the other end to the motherboard, and plug the secondary power supply into another 24pin female plug to switch the power at the same. ? Reminder: 1.Be sure to recognize the direction when inserting the cable! Dont insert the cable backwards or insert the wrong position to prevent the device from being burned; 2.If there are pins off, you can plug back in the direction of the slot, does not affect the use! 3.If you have any questions, please contact us, we will answer you in time.