LG G4 User Manual page 146

Settings
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or messages outloud. Tap Message/call voice notifications to modify
your notification settings for Calls, Messages, Read messages, and
Language.
Lower screen brightness Enable this option to dim the backlight.
Font size Allows you to set the size of the text.
Touch zoom Tap the switch to toggle it On or Off. On allows you to
triple-tap the screen to zoom in and out.
Screen color inversion Enable this option to invert the screen colors
for higher contrast.
Screen color adjustment Tap the switch to toggle it On or Off. On
allows you to adjust the screen's hue and contrast. Tap Screen color
adjustment to adjust it.
Screen color filter Tap the switch to toggle it On or Off. On allows you
to change color filters.
Power key ends call Enable this option to enable the Power/Lock Key
to end a call.
Hearing Sets options for people with impaired hearing.
Captions Tap the switch to toggle it On or Off. On allows your phone
to display caption text. Tap Captions to access and adjust its settings.
Notification light Tap the switch to toggle it On or Off. On enables the
notification lights you set. Tap Notification light to set its notification
options.
Flash alerts Enable this option to enable the camera's flash to blink to
notify you of incoming calls and notifications.
Turn off all sounds Enable this option to silence all phone sounds
including sounds from the earpiece.
Audio type Allows you to set the audio type.
Sound balance Move the slider on the bar to set the sound balance
between the left and right channel.