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This headphones can adjust outside volume via volume contron switch.When you stand
in a place, where is full of noise,the headphones can turn down the voice to under 75 decibel
automatically to protect your hearing.Of course ,you can adjust the volume by yourself.For
example,you can turn up the volume,when you can not hear the voice.
At frist,the headphone collect the voice from outside.Then, it convey the voice which is ad-
justed to a ideal volume to your ears.
XiaFei Ding Lin Fu Zun Zhang Xiaopu Jiang