Jabra 2400 II QD Duo NC Wideband Balanced Wired Headset - Black Noise-cancelling microphones reduce unwanted background noise and are ideal in crowded and noisy open working environments PeakStop instantly removes any harmful loud sounds before they even reach your ears Kevlar -reinforced cords are built to last With Freespin you can rotate the boom arm 360 degrees without the risk of breaking Multi-device connectivity allows you to purchase a variety of different cords that let you connect to your smartphone or desk phone