I bought this ear piece because the microphone on my iPhone got damaged so no one was able to hear me. I have to wear this throughout the entire day so I wanted one that wasn't too bulky and wouldn't cause my ear to be sore. The first couple times I used this my ear did get sore but after a couple days once I got used to it, I don't even notice that I have it on anymore. The battery stays charged for a good portion of the day and it usually isnt until the evening that I end up having to take it off to charge. Everyone I have asked has said that they are able to hear me clearly without a lot of background noise. I also do not have any problem in regards to be able to hear and understand what the person on the other line is saying.