PiPO M9 pro OTA - Manual (Page 36)

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Sound: turn off touch sound by tapping ―sound‖—―touch sounds‖
Display: To set Brightness, Wallpaper, Sleep time-out, Font size here.
Screenshot: Tap ―Screenshot‖, ticket the option ―show screenshot button on
the status bar‖. There will be a screenshot button on the bar.
Storage: Check internal storage here. If you insert a Micro SD card, or USB disk,
you can check the total and available space for your Micro SD card or USB disk.
Please unmount it to safely remove it.
Battery: Check the Battery status here.
Language & input: to set language and keyboard input.
Backup & reset: to go to submenu "back up my data" and "Factory data
reset". If you choose factory data reset, all data from your tablet's internal
storage will be erased. Choose this option carefully.
About Tablet: To check information about your tablet, such as Model number,
android version, etc.