Someone already wrote a great article with pictures for the QC20. It is highly accurate and we've seen the exact same replicas on the Amazon marketplace and eBay listings. Be careful out there and make sure you are an informed buyer. The replicas will usually work ok, but you will be paying for overpriced copies with no warranty.

http://www.head-fi.org/t/761929/how-to-identify-a-fake-bose-qc20i-including-images-and-comparison

©2016 by lexastech