Plug and play, storage does not take up space, improve the sound effect of mobile phone external playback volume
Time: 2021
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great
It's quite good
OK
Let's just say, it's suitable for parents who are old and deaf.
Good design
The principle is clear
The principle is about this, ask closed wheat again
Very good!
How to amplify
Beautiful
You can easily be copied without a patent
As long as designers don't help people copy, they can't copy anything.