earphone

noun

electro-acoustic transducer for converting electric signals into sounds
電気信号を音に変えるための電気音響変換器

it is held over or inserted into the ear
耳にかぶせられる、または、耳の穴に入れられる
- it was not the typing but the earphones that she disliked
  彼女が嫌いなのはタイプライタを打つことじゃなくてイアフォンである

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