No separate battery to keep charged, excellent,trusted sound.

These fit the bill perfectly. While I have full over the ear headphones when I am at home, those are too bulky to carry on trips, especially anything involving plane flight, where size counts for carry on bags. I favor these over separate ear plugs that hang loose, and never fit my ear. And if that isn't enough, audio quality is nearly equal to a friend's loose fitting plugs that he paid almost $100 for. These have clear sound, minus just a touch of bass which is not surprising, while still giving a full body of sound. My cellphone has a built in equalizer, and some day I may attempt to improve the default sound by making a personalized setup for these headphones. But it should be noted that I do not feel any great urgency to do so, either. Hope this all helps!

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