For a first approach to a Bluetooth headset closed type, my first helmet of this type, whereas usually I was using that in the wired Sennheiser, I must admit that the result is quite stunning. First I find this very nice helmet, light and confortable.L'arceau is adjustable and pads perfectly fit the contour of my ears. While its design is a bit "plastic" but its design is very modern, especially in white. Then, in terms of sound reproduction, we must say that I have only FLAC files in my smartphone, or at worst compressed files at 320kbps, so the source remains quality, yet bluetooth listen, I finds that there is too much present distortions, so I go down my one-star rating compared to my original com after 15 days of use. Using the integrated equalize in my old galaxy s2, I quickly readjusted the spectrum, but without making too many adjustments from the already personalized settings for my other stereo headsets. For these readjustments Philips offers me a nice amount of spectrum with pretty low, decent midrange and treble that does not whistle ... treble at least more "clear" and accurate as my wired seinnheiser. The whole is very balanced. I find sufficient power helmet and what made me the most hallucinating, is the signal range ... I took it for use essentially at home, I can walk around my house in the garden without any stall: 30s house with stone walls 40cm thick! Unlike infrared headphones you will not hear breath soon as the signal decreases. The insulation of outside noise helmet, seems a light can still but in my case it does not bother me because I do not use it in transportation. After that it should be objective, there are much better quality headphones but have you seen how much they cost? at this price (-50%) frankly it's a big deal to the unbeatable quality / price. Only the titles of advance remote control whose reactivity seems a bit random ... it just you it the receptivity of the phone? I find this so beneficial that I ordered on another to offer. that said, this first bluetooth headset experience tends to make me go to a more efficient model helmet ...