Product description    Improve sound quality with evolved sub chamber mechanism AR. Deep bass reproduction with tightened acoustic register. Select a feeling of fit that suits your taste in the 2 position post to ensure high sound insulation. A 12.5 mm driver equipped with a strong magnetic force magnet that hands over the superior model and enables a powerful low frequency expression. Built-in condenser microphone for phone calls on smartphones. It corresponds to major smart phones such as GALAXY， iPhone， Xperia. You can make a call quickly with the 1 button type remote control (for some smart phones， use the attached conversion code). It is possible to operate incoming call answering / ending / music / movie playing / pause with just one button. With volume with volume adjustable at hand.