Electromagnetic Passive Buzzer Active Electromagnetic Buzzer Piezoelectric(self-excited)buzzer
The bus driver wears Headset drive, have seen?
Whether you believe it or not, I believe it anyway!
To Dongguan, I found that basically no bus drivers not wearing Headset, they all have thecornet, basically commuting time always playing mobile phone, also don't know here Is it right?Wood has banned this, anyway, is to see more.
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