Which Google Cardboard product should I get for Iphone 6?

I don't really know that much about this product, but i've wanted to try a VR headset for a while and this seems like a really cool cheaper alternative. I'm not looking for the actual VR headsets, just the cardboard ones because i'm not willing to pay more than 20 dollars. Anyways i've searched online and there seems to be many choices so I was just wondering which one would be best or if they all do the same thing. I also saw someone do a review on one and it had a side button so does that come with all of them or what?

IPhone 6 is 4.7" across the diagonal. So when you have your chooser to pick which one you want to order, you can filter by screen size. Select (4.5" to 4.99") and it will filter out a few that won't fit.

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