Logicians and their bonnets
百亿和十亿级别的企业研发投入总和1.76 万亿元，以6.39%的企业总数（378 家），占到全部研发投入的六成（64.94%）。
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Alongside their comfortable fit and excellent sound, Mangino also highlighted their battery life in her review, saying "Being able to wear them all day is one thing, but having them run all day is equally important. These are reliable headphones. When I wear them for a couple of hours per day, I can go a couple of weeks without charging them."