Bluedio A (Air) Stylish Fashionable Wireless Bluetooth Headphones with Microphone HD Diaphragm Twistable Headband 3D Surround Sound (White) Twistable, flexible and comfortableThe headband isnt simply twistable, its ultra-flexible to reduce the wearing pressure, together with the pivoting earcups and soft padding to create a custom fit. 3D on for a live experienceOnce the 3D Sound is turned on, the DSP software will execute a proprietary algorithm, to extend the traditional sound field in two dimensions. Immerse you in sound all around. Just for styleEvery detail was carefully considered, the sleek curves, the oval earcups, the vivid patterns: through the stylish printing process of HTP ( Heat Transfer Printing ), just for those whore looking for style. Hear the differenceThe drivers are engineered to deliver strong and deep bass, without compromising the clarity: thanks to our exclusive technology of HD Diaphragm. Hear the difference even in your favorites. Latest Bluetooth 4.1 technologyThe Latest Bluetooth 4.1 technology is remarkably power efficient, on a full charge, the built-in battery can last up to 20 hours. Your favorites just keep going and going.