The Apple Earbud Function Button Tester: The BaKo Type BK2121 was developed in response to Apple’s need to maintain quality control in earbuds which contain function controls and an internal microphone, designed to be used with newer IPods. It is a compact, easy to setup, easy to use machine with a short test time that you can use to functionally validate each earbud unit as it comes off the product line.

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