The 1/f fluctuation of natural sound enhances relaxation, and alpha waves are emitted from the brain, leading you to a state of super concentration. It is ideal for studying, working, reading, and sleeping. Please use it with this product as well. 【作業用・勉強用】6時間一緒に勉強しようwith超集中BGM【波の音×オルゴール】 • 【作業用・
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