On phone calls the audio is clear and Ive not had any issues with the person at the other end hearing me clearly either, and have checked a few times with the first use to make sure. Upon arrival of the CCA-C10 though, they realized that it had taken the place of the ZSN as better and well worth the price difference. It isnt going to collapse from the weight of the shoes but if you bump into it in passing it may fall over. it was very easy to hook it up to my Bluetooth. They are slightly large (wide) for the size. The soles of all our shoes are showing more wear than two weeks worth. I have a disc issue and my mom has always raved about clarks being comfortable so I decided to try these out since I needed a pair of wedges. Used it to watch TV or with a smart phone in TWS. Was expecting much better quality from Sony. Assembly instructions show a single mounting bar, there are actually two, so make sure you get the spacing right.