This AC/DC portable power supply converter/adapter is extremely convenient and useful. Have you ever wanted to test a fan or a light kit but didn't want to power down your computer, just to hook it up and see it if worked? Or have you ever wanted to place a CCFL lighting kit that wasn't anywhere near your computer power supply? This solid unit is great for tech enthusiasts for testing purposes or to simply power any 12V DC accessory using any available AC outlet. Simply plug in the unit to the wall, and then plug in your fan or lighting kit to the 4-pin molex connector, it couldn't be easier. This 2 amp model can support up to 5 fans!