Listen up, silence is golden
Digital Mimisen have an in-built microphone that picks up environmental sounds so that it can figure out and emit opposite wavelength sounds to cancel out the original noise. But this doesn't mean you'll be cut off in complete silence: Though the earplugs have been designed to cut unwanted noise, they still allow the wearer to hear specific sounds, including phone ringtones, people shouting out to you and train station announcements.
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