The audio is fine until you decide to use it for hands-free calls. Audio output from the speakers and microphone-in is of unacceptably poor quality. I hope it's just because it's the Bluetooth 4.0 version. Someone mentioned that connector B fits all headphones KZ makes. The reader is warned - this is simply not true. There are ports A, B, and C, and each is different enough to make a difference.
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