OVC On Ear Modular Headphones with Microphone for Apple iPhone,Stylish Denim Design Over Head Headphones with Two Optional Earcups-H7;

TUNE SOUND BY YOURSELF
-Based on aerodynamic and acoustic principles, aircharger is introduced into this earphone, you can use the pin in the package to shift the screw on back of earphone, you can use the pin in the package to shift the screw on back of earbuds to get different sound effects through changing air intake.
-When screw's hole positions at left, strong bass is produced, you can use this earphone for gaming or experience 3D effect, get rock&roll.
-Middle position of the hole, means suitable to most genres of music reproduction, including classic, pop music. Right position make the earbuds more suitable to light music

CARBON FIBER COMPOSITE DIAPHRAGM
The composite material of diaphragm is processed by carbon fiber, paper, and polyethne terephthalate, that features appropriate internal damp, lower density, while more rigidity, it improves significantly efficiency of electroacoustic conversion, eliminates harmful selfresonance, as a result, it produces better dynamic, less distortion, powerful and accurate sound response.

AIRCHARGER TECHNOLOGY
To get different sound effect, shift the screw by the pin in the box.