Headphones

Headphones are made in a range of different audio reproduction quality capabilities. Headsets designed for telephone use typically cannot reproduce sound with the high fidelity of expensive units designed for music listening by audiophiles. Headphones that use cables typically have either a 1/4 inch (6.35mm) or 1/8 inch (3.5mm) phone jack for plugging the headphones into the audio source. As of 2015, most headphones are amplified by a headphone amplifier, either an integrated amplifier (e.g., in an iPod) or a standalone unit.
"Who invented HEADPHONES"
Nathaniel Baldwin
Nathaniel Baldwin (December 1, 1878 – January 19, 1961)[1] was the inventor of headphones and a supporter of the early Mormon fundamentalist movement.