Samsung DP515A2G-K01US - Manual (Page 54)

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Chapter 3.
Using the computer
F9 Mute Toggle the sound on and off.
F10
Volume control Adjust the volume.
F11
F12 Power saving mode Switch to power saving mode.
The wireless keyboard automatically enters power-saving mode if there is no key input for a pre-determined period of time. Press any
key to resume using the keyboard in power-saving mode.
However, a function to turn the keyboard off is not supported.
Using a wireless keyboard/mouse
(Optional)