Easy-to-adjust, small-diameter, swing microphone can fit the position of the mouth and picks up the voice Equipped with convenient microphone mute button that can quickly cut the call High quality Ø40mm drivers are adopted as headphones that can listen the call or enjoy music The volume adjustment* can be quickly done without operating the personal computer at hand Connecting by USB and plug & play without driver installation on the personal computer *It is possible to lower the volume (unnecessary power supply) but doesn't become muffling even if minimizes.