I am not sure if all Lujex keyboards have this problem but the one I received had an annoying buzz come through the speaker so I returned the product. I didn't have any others to compare it to, but if it was specific to just this particular keyboard, I would consider buying another. I did notice that if I propped up the speaker, the buzz would go away...but you shouldn't have to do that. I liked the size and portability. Keys are pretty sensitive and sometimes chime twice. The sound is what I expected for this type of keyboard.
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