Have a stereo headset for professional calls searched, without Bluetooth frills and not this typical supplied 0815 headsets. Runs fine on BlackBerry and various smartphones such as XPERIA. Voice quality and microphone is great. Long telephone conferences are no longer a problem. However, the headphones really press after an hour in the very ears. Ergonomically is different. Music quality is ... pretty underground. This is for an emergency, but brings no pleasure. The flat cable is great and not knotted. An angle plug would have been fine. So the connector is always on the device and it will hang. Worse are the cable lengths. Without extension, the cable is a few centimeters too short for you pocket - with extension one has ever much cable, this fat joint and you do not know where to put it. Little thought. But ok for about 25 EUR. Hopefully holding the thin cable, and does not break ...