Because the current high- supply is relatively expensive, using this line can switch the two supplies with low at the time, thereby increasing the of the supply. When connecting 5 graphics cards to swipe coins at the time, the of the supply is not enough, and the high- supply is out of stock and the is quite expensive. The adapter card here comes in handy. Through this card, the two supplies can be switched at the time. The graphics card is allocated to the two supplies to substitute high- supplies. Precautions:Be to recognize the direction when plugging in, and 't plug it in reverse or off-position to prevent the device from being burned. When plugging in, hold the socket of the device before plugging in to avoid inserting the socket pins with excessive force. Wiring:The main supply is connected to 4PIN, and the 24P cord of the auxiliary supply is plugged into the adapter card, which can realize the auxiliary supply and the main supply are turned at the time to the supply and the life of the graphics card. Colour:green Material:PCB Size:3 x 6.9cm Package Contents: 2 * 4Pin interface synchronization boards Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.