First all, I got the camo. I was thinking of using on a four wheeler or deer stand and the color pallet is just zany. This is like cartoon camo not actual camo. Very bright and very sharp contrasts.There are 3 keys included and they do not use a "tooth" pattern on the edges but a groove on the face of they key so what ever is going on inside is pretty subtle. The chain feels heavy but I cannot tell what is keeping it inside the cuffs as that portion is covered in plastic. It does swivel, so I assume it is a ball captured by two halves. There are no visible screws keeping the plastic on so it probably snaps and I just kind of have to hope the ball is in metal underneath.The locking mechanism is not sprung. So you have to both open and close it via the key. You cannnot just snap it closed, you have to unlock it, close it, then re-lock it. The visible internals appear to be chromed or nickel plated but I don't think this is going to do too well over a rainy or snowy season. The "alloy" claim typically means they have reduced the strength, not enhanced it.The keyhole is not covered and the plastic housing kind of make a funnel.Overall, it seems much heavier (4.4 lbs weight) than a comparable device using cables.Update: The manufacturer has now sent me two messages. Both are lengthy paragraphs. They are apparently not happy that I did not find this product to be anything more than just okay. Some of their comments lean towards just calling me dumb and unfair. Interesting business model to be sure. So, I suppose the next step is expose this thing to the weather and attempt to defeat it using simple tools. Perhaps it performs better than I assume.See the photos :I left it out in the weather since the last update and to my surprise, not a bit of rust. I appears I underestimated the coatings. Good on them. Camo is still silly colors.One side was set on "wide" with the lock on the first available notch. The other was set on fully closed on the tightest available notch. Next, I whacked it with a framing hammer. First shot the plastic was gone, showing the pins that hold it together. Two hits later and it popped open. The moving part no longer aligned with the fixed part. The key was very stiff and I had to wiggle and wrangle to get it to re-lock. Once I did, I could not get it back open. The key no longer worked and the mechanism would not turn enough to unlock. So, I attacked the other side. Plastic was again gone on the first hit. It opened on the fourth so it did a little better but was bent too badly to continue testing. So, while nothing is "theft proof" this can be defeated with a hammer or brick assuming whatever you attach it to supports it enough to hold it in place. It seems easier to do if you lock it in one of the wider settings.A casual or oportunist theif will likely avoid it due to its relativley intimidating appearance, but as my intended use would be remote woods, and it would have only taken me about 20 seconds with a field rock, I will not be getting another.