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Sometimes, people put an i-Phone or a MP3 into the pocket without turning the power off, even though it is played. It promotes the consumption of the battery and you can't use it when needed, due to the insufficient capacity of the battery.
To settle this problem, an ON/OFF earphone using the pressure of air inside it, was developed.
The rubber of the earphone to protect ears is made with a transparent material same to a tube. When you put it in the ear, the pressure of air inside the tube simulates earphone's sensor to operate, and it is automatically switched off, when it is removed from the ear.
seoul national university of science & technology
Goyang-si, Gyeonggi-do, South Korea
Hyunjoo Lee Sunmi Hwang Jiwon Seok