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the fourth index button on the top side of OP-Z is called screen. the screen button is used to display the current battery charge, or used in conjunction with the app to navigate around or to display the current battery status.
when using the OP-Z standalone, you can press and hold screen to show the current battery level of the OP-Z internal battery.
when using the OP-Z connected to the app, holding screen and at the same time turning the dials will allow you to navigate through app pages.
screen is also used to activate the camera on photomatic.