TLDR: Looking for ear buds that ensures your voice is clearly heard? Buy these.Details: I purchased these to cut out background noise being picked up by the microphone - that is, other people cannot hear ambient noise around me. And these work great!By FAR these are better than BOSE and JBL for mic performance. (BOSE is marginally better for speaker ANC performance.) Totally eliminate microphone background noise such as keyboard typing, dogs barking, toilet flush, running water, wind noise, etc. My caller cannot tell what I am doing or where I am. It is so quiet that if I am not talking my caller thinks the call has lost connection.The only negative, as noted by other reviewers, is the ear buds fit in the case in an odd way. If you put the right ear bud into your right ear and left ear bud in your left ear, you must twist the ear bud around in your hand. And they are a little slipper so you will drop them. I have found two solutions to this: put the right ear bud in with your left hand and vice versa, or turn the case around and reach over the lid to select the right ear bud (now on the left side) to put it into your right ear. A minor inconvenience for a great product.Also, I purchased a siilcon protective case with carabiner which I like.