推荐一个 macOS 上的免费软件 WhatCable。在菜单栏上增加一个图标，点开就能看见每个 USB 口插的什么东西。关键是，能看到充电口的状态，瓦数、电压、电流。方便找到为啥充电这么慢的原因。很实用。
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