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 | That is really helpful for the people who would like to buy headphones. |  |
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 | Yes. |  |
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 | But what is it's contribution to mankind? |  |
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 | oh! Well... |  |
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 | It helps during war, to call for help. It also helps plane pilots to communicate with the base, it helps with everyday life to either call for help, have devices or simply just to listen to music or videos. |  |
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