As with all typical Plantronics headsets, this sound is clear and no one can tell you are on a headset on the other end. My only gripe is the cord seems a bit fragile the the earpiece volume is not as loud as it should be for use in a vehicle which is why I gave it 4 out of 5 stars. Other than that, it works very well and is fairly comfortable for extended wear on your ear. I like the fact that it does not go over your ear so wearing glasses is not a problem at all.