Nhờ sửa bài giúp

I can't live without music, I can't study or focus in something without music, for this reason, the most important object for my are my headphones, because sometimes I feel the need to listen music, radio or hear something.

When I am studying, I don't feel good in a quiet place like the library but neither a noise place like the coliseum, just I put the headphones in my ears and focus in the thing that I do.

The headphones are a transmitter, amplifier and transformer the sound.

Headphones were invented in 1910 and used for the United States Navy, after in the first and second war world, it were used to communicate the aircraft carriers, warships, planes with the Air control.

After, headphones were used by telephone and radio operators in 1943.

It became very popular with the Walkman in 1980.