A USB Y connector should normally, that it provide a USB port doubling twice with all its normal USB functions. This item works only for charging for example of a Samsung Galaxy S3mini but not for Apple products. This does not even recognize a charge current or USB signal when using this product.
So only buy if you want a Samsung Galaxy S3 mini load eg battery. And complaint is indeed accepted, but only in return at their own expense! And that is hardly worthwhile in the article.