I received today these headphones and they were disappointed with their very weak sound and sometimes the sound ...

I received today these headphones and they were disappointed with their very weak sound and sometimes the sound generally disappears either the product is defective or not of very good quality. I'm disappointed. I do not advise buying. And they also have one minus a very thin cord that will quickly break down.I do not understand why such a weak sound I can not enjoy music because it was written that made on new technologies a very powerful sound I'm very sorry for the sound This quiet I sometimes completely disappears when I walk when walking the sound disappears

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