Acer 3400 manual Hot key Icon Function Description

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Hot key	Icon	Function	Description
Fn-F5		Display toggle	Switches display output
			between the display screen,
			external monitor (if
			connected) and both the
			display screen and external
			monitor.
Fn-F6		Screen blank	Turns the display screen
			backlight off to save power.
			Press any key to return.
Fn-F7		Touchpad toggle	Turns the internal touchpad
			on and off.
Fn-F8		Speaker toggle	Turns the speakers on and off.
Fn-↑		Volume up	Increases the speaker volume.
Fn-↓		Volume down	Decreases the speaker
			volume.
Fn-→		Brightness up	Increases the screen
			brightness.
Fn-←		Brightness down	Decreases the screen
			brightness.

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