I bought this to control the speed of some computer style 50mm fans that I use to keep the temperature constant in my nano reef aquarium. I didn't want the fans to run at full speed because of the noise level. This device was so easy to use. Just enter the power in clearly marked places and the power (fans) in other places. Plug the 12V DC power adapter into the wall and adjust the speed with the dial. Couldn't be easier. Good product. I bought another to drive a different set of fans.
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