I have 10 transformers - 12v 200mA or 0.2A. They are used but I checked them all and they work. You can use them to drive computer fans. I have 1 running (2)120mm fans on low speed on my tank and it dropped the temp from 83 to 79degrees. On low speed, they are so quit, I can't even hear them. I had to look at them to see if they were working. I'll bring them to the next meeting in November if any one is interested.