For a club-like sound, add extra bass. Hands-free calls with an inline microphone and remote Neodymium 12mm driver units Extra deep bass with Powered Bass Duct++ Cable that doesn't tangle Earbud tips in four sizes Note: You might not get the right sound quality or call performance if the earbud tips' sizes don't match your ear canals' sizes or if the headset isn't worn correctly in your ears. Replace the earbud tips with ones that slide into your ears more securely.