Bought 6 pieces, 3 of them buzzed/vibrated horribly. Didn't get any help from them. Support I opened up the blocks and found that the transformer screws were loose and the board wasn't wide enough. After tightening the screws and applying electrical tape to the PCB, the noise disappeared, indicating poor quality. After 2 years I found out that these devices DO NOT WORK as advertised. I can control and display the tension, to my surprise I found that they stop regulating the tension. This went for hours at 130v and later I had a 136v spike as well as the false sense of security when using these things.
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