The Plantronics .Audio 655 USB delivers exceptionally high audio using the 40mm speakers - which deliver studio-quality audio with maximum bass response perfect for music, multimedia, gaming and PC chat. All the controls are intuitively placed for quick and easy control: volume up and down are positioned on the ear pod and with the microphone mute activated when the boom is stowed you will always be in control. For Internet calling (VOIP) a QuickAdjust microphone provides precise placement and noise-canceling features ensure that Internet callers can hear you clearly. The design ensures excellent comfort for hours of use.