Feelworld FW7D/O - Manual (Page 14)

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（ Function）
After select "function", press ““◄”or“►” button to confirm, then
enter into parameters adjust. Using ▲”or“▼” button to select
adjustable items, then using “ “ ◄”or“►” button to adjust the
parameters.
※ Reset：Back to original setting.
※ Display Ratio：To change the display ratio 16:9/4:3.
※ Screen Marker:（80%、85%、90%、93%、95%）
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( Sound)
After select "menu" function, press “◀ ”or“ ” ▶ button to confirm.
Then enter into parameters adjust. Use “▲”or“▼” to select
adjustable options, then use“◀ ”or“ ” ▶ adjust specific parameters
※ Volume: To adjust the volume.