Your right, I was high. It has a volt switch on it. I own two of them and they work great. Looks like this.... http://www.radioshack.com/product/index.jsp?productId=3875402&retainProdsInSession=1
Radio Shack has AC to DC adapters with an amp switch on them, has 4 or 5 settings on it. Highest is 12 amps, $19.99. perfect if you are using a computer fan. I spliced mine to my power cord for my lights which is on a timer (of course).