Concerning this item Superior sound quality: 10mm drivers with a bio-cellulose diaphragm (20% bigger than standard earbuds) provide high-fidelity sound with exceptional clarity. For 70% more bass, switch to BassUp mode. With cVc 8.0 noise reduction technology, calls are clear: To guarantee that you are heard clearly even in noisy environments, your voice is amplified and boosted while background noise is successfully muffled.