The sound quality is impressive considering the low cost of these headphones. At this point, you will no longer receive the bonus. The charging case is the primary source of the problem. After less than a month of use, the headphones started to have trouble fitting into the charging sockets and would occasionally pull away from the ports before automatically connected to the phone. Since purchasing the headphones, the quality of the conversation that can be heard via them has significantly decreased. This is not even taking into account the dirty case. The conclusion is that these are good headphones for the price, provided that you use them with meticulous precision. However, if you don't have the time to put in more effort into a product, then you shouldn't bother with it.
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