was looking for a multi-purpose headset for conference calls (eg home office) and air travel. Application: very high quality: stable metal clip and metal hinges, all cable connections with plug, ie no risk of buckling, robust connectors with metal housing and bending protection. Functionality: excellent: USB charger for battery, handset umlegbar flat, saving space, 2nd strap allows comfortable sitting on a big head, sound: good, neutral, enough without unnatural emphasis of bass and treble, no hi, but for MP3 it definitely. NC works very well, compensation barely audible