... mute fuctions 3.Cystal clear noise canceling Digital Sound Comfortable computer earphone, microphone headset ,VOIP headphone , Volume Contol, Mic/SpK ... Needed,Universal compatibility to PC and MacDigital Audio/Sound Quality, Ideal for VOIP,Music & Gaming. Flexible high quality noise canceling ... length: Around 2.0 M Connection: USB2.0 Comfortable computer earphone, microphone headset ,VOIP headphone