It means 2.4 GHz or 5 GHz
2.4 If you use it, the speed is a bit low, but it passes through obstacles well, so Wi-Fi works well even if there is a wall
If you use 5, you can't receive it if there's a wall, but if there's no wall, it's faster
It will be hard to feel the big difference if you use the internet with your cell phone
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