Built-in efficiency, reduce noise controller of environmental noise. Can reduce environmental noise, the highest 22dB 200Hz in May, when the noise reduction. 92 percent A nd rare earth magnet guarantees quality excellent voice unit. 8 speed - 22kHz super-wide frequency response range guarantees the predigested music output. With headset can discount single cables, makes users easy to carry. Compact portable travel to become your packing GS806 traveling companions