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The ultra-low frequency electromagnetic wave emitted by this product can effectively penetrate the wall, and it will not reduce the use effect due to being blocked by objects. The ultra-low frequency electromagnetic wave emitted by this product can effectively penetrate the wall, and it will not reduce the use effect due to being blocked by objects. The ultra-low frequency electromagnetic wave emitted by this product can effectively penetrate the wall, and it will not reduce the use effect due to being blocked by objects.