Strange that the Subwoofer socket is an input rather than output?

Yes, the mystery is what could this thing be for? What would be the use of a Woofer IN with two Front OUT? And if this would be some sort switch, how would it be controlled: no IR in, nothing appart INs/OUTs and Power. Should it be reversed I would understand it was what SIA43 said, but this ?

My first thought was similar to Sia43's suggestion. Of course the labeling doesn't make sense, unless, it is trying to indicate which port on the OTHER equipment to hook it up to. For example, SUBWOOFER IN means to hook it up to the input port of the subwoofer. Otherwise, maybe it is a remixer for someone that has a high-passed center channel and low-passed subwoofer channel and wants to run left and right full range speakers? I also noticed the lack of an IR connection. Could it be on the side of the box and not pictured? Glitch

I wouldn't say it's a scam but at least its a misleading sale. Top and side views are not the same item: On the top view it's a C7 power plug and there is only one "screw ear", on the side views it's a 12v jack and both "screw ear" are there. Definitely not a 1638 BL Active.

Good catch on the power cord. Maybe there is a clue in the seller's name (i.e. ishams*123)? ;-) However, looking at the rest of the B&O stuff that he has for sale, it is probably a legitimate oversight in the pictures. Why scam people on a $50 item when you are selling a bunch of more expensive stuff?