Noise-cancelling Ear Plug

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Aug 14, 2014 20:58
I bought the noise-cancelling earplug, called MM1000.
Noise-cancelling is a technology to offset noises with a special sound which the plug releases.
The technology had been adapted for only expensive headphone.
MM1000 is popular because of the cheap price which is realized by devoting to only noise-cancelling function.
I had expected I could focus on writing Lang8 diary in the silent circumstance with the device.
After using it, I learned that it can’t offset people’s voice, which annoys me the most.
MM1000 is not useful for my purpose.
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