The Seasonic VERTEX PX-1200 is a high-end power supply unit designed for computers. It has a maximum power output of 1200W and is 80+ Platinum certified, ensuring high efficiency. The unit is ATX 3.0 and PCIe 5.0 ready, making it compatible with the latest computer components. The product is an open box item, meaning it has been previously opened but is in like-new condition. The dimensions of the unit are 4.5 inches in height, 13.6 inches in length, and 7.3 inches in width.