These devices are so loud that you can't use them in any room where you'll be spending time. The high-pitched noise and constant hum will disrupt your sleep. I strongly advise against purchasing these. I can't recall if I got them from an online retailer or another site, but it was a significant mistake. They are truly terrible. I'm throwing mine away. What a complete waste of money. I've had them for nearly two months and have noticed no improvement.
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