Okay, I'm really confused by that product listing. My initial impression was:

"It looks like it only has repeaters - where's the IR receiver? Wait, the product description makes it sound like all four of those things that look like repeaters are actually receivers. In that case, where's the repeater(s)?"

I checked out the primary customer review, and it seems to indicate that it does in fact come with one receiver and four repeaters (not sure if my terminology is accurate, but it's descriptive). I don't see the receiver in the photo, but that might be what's on the top-left.

Please let me know if I'm not the only person who's confused