Korean students cleverly use sound insulation ear plugs to transform alarm clock

When you are sleeping, the loud alarm of the roommate will surely make you bored. According to reports, a university student in South Korea invented a new type of alarm clock whose voice can only be heard by users.

The inventor said that this alarm clock works by using bluetooth soundproof earplugs. The user only needs to install the application on the mobile phone in advance, set the alarm time before sleep, and wear an earplug. The sound will only be heard by oneself and the friend can sleep well.

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