henggeler6 years ago000If I add the PXC-550 and the PC dongle BTD 800 ML, is the bundle technically completely identical to the "MB 660 UC" from Sennheiser?Show in original language (German)hoehnl6 years ago000 Helpful answerNo, not in my opinion. I own the PXC 550 and I wouldn't know that it has features like the hybrid adaptive Sennheiser NoiseGard™ ANC technology, SpeakFocus, Own Voice Detector, Windsafe or Room Experience.Show in original language (German)Comment