The headset is very solid and well made. The earpieces are attached to a relatively stable metal bracket and be able to push yourself to adapt to the head without any problems in the proper position. The temple is covered with leather on the upper part, the processing of this upholstery is impeccable and is not quite the cheap headphones to shame. The earpieces are made of plastic, but do not act "cheap", the ear pads feel extremely comfortable and do not bother even after hours of wear.
The function of the headset is very simple: you turn on it, the smartphone Bluetooth enabled, and already the headset automatically connects to the phone ... without pressing the headset itself nor anything. The connection is then retained even stable and allows an absolutely trouble-free music channels. The volume is adjustable on a control on the headphones.
Something futuristic: the headphones speaks! :-)
Sounds weird, but it's true; a woman's voice are various Info's, depending on the operating condition. Thus, the headset will announce whether the "on" or "off", as the state of "pairing" with the Bluetooth opposite and when the battery level requires recharging.
The sound via Bluetooth on the smartphone is very good, clear and dynamic, but of course depends on the quality of playing MP3s.
Using the supplied cable you can headphones also "tied" to operate; so I connected it to my home stereo, where the also emits an excellent audio performance. The bass is full but not too dominant, the heights brilliant .... for my ears the perfect sound!
Although the active noise reduction works very well, in my opinion, but not quite as effective as another that I use headphones, earpieces which are completely inside the ear. The sound quality of Sennheiser's not reached this other headphones, however.
Whosoever therefore would be interested for a new headset to these Sennheiser write not miss the note; I personally would choose definitely for this due to the excellent sound.