This Discovery 640 does a good job of connecting and re connection to my Motorola Razr. I get great sound on my end but as with many of these headsets the other party comments that I sound like I'm talking with my head in an echo filled bucket. Call quality in a quiet room, is okay, but in my car, (where most of us would use a headset) my voice sounds hollow as the road noise competes with my voice.Before I purchased this item I saw another model with noise reduction circuitry. I wish I'd purchased that one.On the positive side the box, the associated chargers and the mult-charge heads make the storage of the entire unit very convenient. This part is well thought out.