User manual

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Mono audio
Touch to combine channels when playing audio.
Accessibility shortcut
Touch to enable/disable quick activating for accessibility features.
Text-to-speech settings
Touch to update the settings for text-to-speech output, such as the
speech rate.
Touch & hold delay
Touch to adjust the duration of touch and hold delay. This function
enables your phone to differ touch and touch & hold, which may avoid
incorrect operations.
Color inversion
Touch the switch to turn on/off color inversion.
Color correction
Touch to turn on/off color correction.
10.4.3 Printing
Touch to check your printing jobs. A print App is required when there
is no service installed.
10.4.4 Regulatory & safety
Touch to view product information.
10.4.5 Developer options
To enable this function, touch About phone/Build number 7 times
and Developer options will be available. The developer options screen
contains settings that are useful for developing Android applications.
10.4.6 About phone
This contains information ranging from Legal information, Model
number, Android version, Android security patch level, Baseband
version, Kernel version, Build number to those listed below:
Updates
Touch to check for system updates.
Status
This contains the status of the Battery status, Battery level, My phone
number, Network, Signal strength, etc.