Corsair RM RM850 850W Power Module is a black ATX power supply with a maximum power of 850W. It is compatible with 120V voltage and designed for 3Com devices. The unit features 1 fan for cooling and various connectors such as 4+4 CPU, 24 Pin, SATA I, and more. With a surge energy capacity of 125J and audible alarm feature, this power module is efficient and reliable for computer systems.