Effect of noise reduction is very good, I have not heard my father at my door upset by knocking out the power to take it,beats by monster, then open to the Z5500 Iput ordinary, listening to music volume ,dr dre monster, so wear your headphones to listen, did not hear the voice of Z5500. The B on the right of the earpiece is a button will mute when pressed,monster beats, and a similar effect, such as Shure's PTH, may amplify the votes, the design is very convenient. In addition to this street where high lead wear, appearance is very fcucking, especially the line of monster, flaming red, the work is very good.