I was looking for a wireless headset with a noise reduction system for listening to music in noisy environments without the risk of going deaf. And this headset perfectly meets my expectations. It is lightweight, fits comfortably in place even when I do sports, is very comfortable, has a very good battery life. The sound quality is excellent with my phone and my tablet. It proved significantly worse with my computer, which must have a version of bluetooth too old, and for the latter, I bought the Sennheiser BTD 500 USB key Bluetooth 3.0. The difference was bluffing and since I use this key with different ordis I use to listen to music with my headphones, especially as the scope of the key is excellent. noise reduction system NoiseGuard greatly reduces ambient noise, especially the bass, but not cancel them entirely. However, it is very significant with office colleagues or talkative in transport. It can be dangerous when walking in town as we hear more cars and you risk getting crushed. The NoiseGuard system also changes the sound quality of the headset is a little worse when activated: the bass is less well rendered. A button also allows you to temporarily silence the music and chat with your neighbor without removing the headset.