I've been using The One for a few months now. It's a decent product. It feels high quality, and the design is nice. As for the effects, they're kind of hit or miss for me. Some days I think it helps me focus, other days I don't notice much difference. For the price, I was expecting something more obvious. Not sure I'd recommend it, but I'm still hopeful it'll kick in more over time.
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OneDevice is a patented wearable device that lets you experience the benefits of light and sound therapy wherever you go.