Title: replace often
Product review: I just purchased the 2nd one of these. The first and now the 2nd after just a day or use, has an annoying pitched background noise that is under the white noise. It's almost like something is loose and vibrating within the machine as I can press on the speaker and get it to stop, which isn't so convenient. I'll be returning the 2nd one and finding another product. I figured the 2nd would eventually go out like the 1st, but thought it would last longer than a day!
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