The instruction is very modest, I learned a lot of functions on my own skin in the course of operation. For example, if you didnโt turn off the headphones and put them somewhere, and received an incoming call, I wonโt hear the sound of the interlocutor in the smartphone, because he is in the headphones :) you must either select the speaker source on the phone (each time), or simply turn off the headphones if you donโt need them (I do this + save headphone battery).
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