Image: iFixit via Creative Electron

Last week, Apple surprise-launched its lineup of Smart Battery Cases for the , , and , and the cases have an intriguing new addition this year: a physical camera button. How the new button works was a bit of a mystery, as iPhones themselves don’t have a button dedicated entirely to being a camera shutter. But now we know a little more about the mechanism, thanks to an X-ray of one of the cases done .

If you look closely at the picture at the top of this post, you can see two thin circuits running down from the button toward the battery before they take a right turn to the circuit board, which connects to the Lightning port, which transmits data to and from the iPhone connected to…

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