At $12 this thing was perfect. I use it for my Hero4 Silver. I haven't used it underwater but I'm sure it will work fine. The door is perfectly sealed. The 2 gaskets (O-rings around the button shaft) on each button appear to be tight, but you won't know for sure until you submerge them in water. I'd bet it would be ok to a depth of at least 10 feet if not more. It would definitely be good for water protection in a splash or rain, but I can't comment on how it holds up underwater (just because I haven't tried it yet). It is almost identical to the expensive branded GoPro case. but for only a quarter of the price. I actually bought it with the intention of sanding and modifying the body for my purposes. In any case, this is a good deal for the price. I noticed that when I open the back to pick up the GoPro, the case gets a bit cramped. I think the round part surrounding the GoPro lens is a little tight so it doesn't fall straight into your hand like a GoPro branded case does. The last thing to note is that the buttons are slightly different from the original GoPro case. They sit slightly higher than the plastic circle around the button. This can cause something to get stuck under the button (maybe), but I don't think that's the problem. In the pictures, there is the GoPro case on the left and the case of this brand on the right.
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