The Comp USA Computer 400Watt ATX Power Supply is a reliable and efficient power supply unit designed for computers. With a maximum power output of 400 watts and a cooling system featuring one fan, this power supply is suitable for various computer systems. The surge energy capacity of 125 joules ensures stability and protection against power spikes. The ATX form factor makes it compatible with a universal range of computer brands, making it a versatile choice for users looking to upgrade or replace their current power supply.