Sennheiser Century SC 630 Premium Single-Sided Wired Headset (504556) Premium single-sided wired headset optimized for Microsoft Lync Comfortable fit that lasts all day and a solid sense of quality Century is built to sound superb, look stunning and outlast the competition Conversations are crisp and clear for speaker and listener, even in noisy environments Century is crafted with high-end materials to ensure maximum durability and design quality