Plantronics Lightweight Stereo PC Noise-cancelling Headset with Boom Microphone & In-line Volume & Mic Controls Powerful Sound - 40mm stereo speakers deliver rich, resonant stereo with maximum bass response Maximum Comfort - Lightweight and flexible, the headset is comfortable for hours Noise-Cancelling Microphone - The noise-cancelling microphone reduces background noise so you can easily be heard In-Line Volume Control - Convenient in-line controls let you adjust music volume or mute the microphone with just a touch Quickadjust Microphone - The noise-cancelling microphone reduces background noise so you can easily be heard