These shortcomings, in fact, are minor and may not matter to someone. But I will describe in order. If you fully extend the case, then a small backlash appears, from which the feeling of the strength of the structure is lost. If you speak through the built-in headset, the interlocutor will hear your surroundings better than you. Therefore, use only in a quiet environment. Apparently, a factory marriage - if you connect to the right earpiece as the main one, interruptions periodically appear if you hold a smartphone in your hand. There is no such problem with the main left earpiece. Well, overly tight buttons that are almost impossible to use.
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