The AH-C700 earphone is sound isolating canal-type inner ear earphone which will reduce ambient noise allowing you to enjoy more of the music than ever before. For strength and stability, an aluminum housing has been used to achieve high rigidity so that dynamic sound is clear and on target. The newly developed Acoustic Optimizer provides optimum acoustic characteristics by adjusting the sound pressure balance in front of and behind the diaphragm. Sound is more dynamic yielding clear bass with proper balance at the low to mid frequency range.