Specification:
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Package Included:
The frequency response is a measure of the range of frequency of signals a pair of speakers or headphones is capable of reproducing - it refers to the quality of the reproduction hardware and has nothing to do with the quality of the actual source signal.
Yes, that will be harmful to the earbuds. We advise you to put your earphones in other pocket. Because it bends the speaker wire inside when it is wraped around the mp3 player.
High impedance means amplifier puts out less power.
Low impedance means amplifier puts out more power.