Powerful 40mm drivers enable deep bass and a wider dynamic range that delivers clear sound at a maximum of 94db for safe listening The adjustable, padded headband can fit a wide variety of ages and the plush, sealed earpads allow for hours of comfortable usage when learning or in meetings Omnidirectional Noise Cancelling Microphone with Volume Control button Provides easy control of volume up/down and mic on/off functions with a noise cancelling microphone Strong 1.8m USB cord allows for great flexibility in placement Works with Windows, Mac and Chromebook devices