Inconsistant sound/volume makes these a poor choice

Sound quality is alright--for about 5 minutes; the headphones volume cuts in half within a few minutes of using, to the point your music is nearly inaudible in a room with ANY noise in it. This is from a FULL battery, mind you. I looked through reviews and didn't see this point, so I'm thinking I may have gotten a defective unit that can't deliver proper voltage from the battery during usage. In any case, I'm very disappointed with my purchase.

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