The Anker AeroClip 2 makes a convincing case for earphones that deliberately refuse to shut the world out. Instead of plugging your ear canals like conventional earbuds, they clip around the outside of your ears, leaving you free to hear traffic, colleagues and, regrettably, anyone trying to get your attention. For commuters, runners and people who spend half their working day wearing earphones, that makes plenty of sense. The biggest hurdle with clip-on ...

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