I'm thinking the piece on the opposite end of the mic was replaced, because it looks EXACTLY like the ear-rest used on sunglasses, which would be odd to have on normal headsets. I think they did thise for them to be used in the opposite orientation, with the mic on the left like Aeryn is wearing it, then the ear rest works the way it does on glasses, though backwards (with the bend towards the front of the ear instead of behind)