Excerpt: Likely you are replacing a broken or lost remote as there'd be no other reason to buy it so I won't go into all the gory details as it only works with an Apple TV. There is one critical reason to make sure you have one. It will work without wifi!
Summary: This arrived ahead of schedule and was a perfect replacement for the (identical) Apple remote I got with my Apple TV. It worked without any setup required - as good as the first one. I'd been using an Apple bluetooth keyboard which was awkward and took time to "wake up".