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Attempted to use to power a fan, but didn't work smoothly - it would have a steady clicking sound (and I successfully got the fan working well with another transformer). It was also of fairly flimsy construction, and the cord didn't plug firmly into the wall plugs. May be fine for USB charging or similar, but didn't work for me with a fan.
It works well. Love that it has multiple ports. It has a slight buzz when powered on that made me nervous at first but it works well. Can’t leave it on in the same room I’m sleeping in, if I’m charging phones or lap tops.