ros中级别界面中的extra-channels是什么意思

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图片中的extra-channels是什么意思

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Extra Channels (also known as Custom Frequency License) unlocks all frequencies supported by your wireless cards, even those outside your local regulatory domain. You can get this license key upgrade if you have some special permission to use other frequencies, or simply don't care and want to take full responsibility of using something illegal in your area. The upgrade costs 10$ per router.


简单说下吧 ，，，，这个主要是用在无线上，扩展频道。升级费用是10美元。