An excellent, lightweight headset with a lot power options, nice form factor, and a slick case that could be better. The 640 is usable with many phones� AC adapters and even an AAA battery, which you can buy anywhere. The sound quality is solid, though not exceptional. It rates it an excellent value in my book.
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| Pros |
Super-lightweight
Great charging options
Three sizes of earpieces
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| Cons |
Case needs some re-thinking
Sound quality just okay |
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Read Merciful by Casey Adolfsson
