For the record I didn't buy mine from Amazon, but all the ones selling for $5 are no doubt OEMs.The earbud headphones that come with these are low quality, and I have to put the mic right up to my mouth in order for the sound to go through. (I tested by leaving myself a voicemail) The prompts from my voicemail also cuts out for some reason, but music seems to be fine. Although I haven't tested it with another set of headphones, it does have a jack rather than being wired in which is nice.Basically, it works okay as a headphone adapter to listen to music with - but I wouldn't use it to talk on much. I would give it a 2.5 stars if there was an option for it, if we're judging by quality alone. If you consider the price, it's about what they are worth.