I have this headphone .This headphone is very Comfortable for running & sport .But one reason In this headphone mic Not Available .Sound System very powerful and Clearly .This headphone is Like that Hadset. You can use Everywhere and .You fit all ear because you Can do small sizs and larze size .suporting jack.2.5 but All Phone Suported .I hope You like this headphone & You Atreched this headphone Like that sporters .I will saw you.You buy this Headphone .very Best Quility headphone.Thanqu