Bluetooth headset which all features are perfectly described, it comes in an oversized box of perfect design, Sennheiser quality obliges. Accompanied by a USB cable to recharge, it is immediate, however. A voice told us it remains between 2 and 4 hours of autonomy. Apart from the sound quality, easy-access controls, the coupling without problem, that is where the rub: the Quick Start leaflet, the smooth voice of the operator which says that you are connected are in English. The link that is supposed to deliver us an instruction manual is inoperative. The Sennheiser website does not offer PDF related to the product. That said, the quality is at the rendezvous. The headset is coupled seamlessly with my Windows Phone Nokia Lumia 625, and the whole is recognized by the GPS "GARMIN" nuvi 2597. It gives an added advantage with the iPod and presumably with iPhones, which is Battery display on these screens. The headset can be positioned on the right ear as on the left ear. Small flat, despite the warning, there is no how the volume is actually set. It seems that automatically adapts to the environment. In case of discomfort, it is possible to raise or to lower it, but blind.