Comes from a brand new PC, that was modified to use a different power. So this may have been used for a day. Nothing comes with it except for what is show in the picture. This Corsair 850w HX850W Pro Series CMPSU-850HX Semi-Modular Power Supply Unit / PSU is compatible with universal brands and features 1 fan for cooling. It has a black color and a maximum power output of 850W. The power supply unit includes a 20+4 Pin connector, noise filtering, and is not modular.