Excellent product. As I have option to test BOSE QC 25 Here is a little comparison. If You Want absolute silence this is not a product for you. Harman Kardon is designed in a way That you can hear voices. So if someone wants to talk to you, You will be able to understand and reply. This is really important to me: because I have a small kid and I can not afford myself to be in a absolute silence. This can therefore be really usefull in a train to hear information, or stewardess in a plane offering you a drink.
