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# Device
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Some command line arguments perform actions on the device itself while scrcpy is
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running.
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## Stay awake
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To prevent the device from sleeping after a delay **when the device is plugged
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in**:
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```bash
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scrcpy --stay-awake
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scrcpy -w
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```
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The initial state is restored when _scrcpy_ is closed.
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If the device is not plugged in (i.e. only connected over TCP/IP),
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`--stay-awake` has no effect (this is the Android behavior).
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## Turn screen off
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It is possible to turn the device screen off while mirroring on start with a
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command-line option:
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```bash
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scrcpy --turn-screen-off
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scrcpy -S # short version
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```
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Or by pressing <kbd>MOD</kbd>+<kbd>o</kbd> at any time (see
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[shortcuts](shortcuts.md)).
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To turn it back on, press <kbd>MOD</kbd>+<kbd>Shift</kbd>+<kbd>o</kbd>.
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On Android, the `POWER` button always turns the screen on. For convenience, if
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`POWER` is sent via _scrcpy_ (via right-click or <kbd>MOD</kbd>+<kbd>p</kbd>),
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it will force to turn the screen off after a small delay (on a best effort
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basis). The physical `POWER` button will still cause the screen to be turned on.
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It can also be useful to prevent the device from sleeping:
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```bash
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scrcpy --turn-screen-off --stay-awake
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scrcpy -Sw # short version
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```
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## Show touches
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For presentations, it may be useful to show physical touches (on the physical
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device). Android exposes this feature in _Developers options_.
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_Scrcpy_ provides an option to enable this feature on start and restore the
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initial value on exit:
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```bash
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scrcpy --show-touches
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scrcpy -t # short version
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```
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Note that it only shows _physical_ touches (by a finger on the device).
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## Power off on close
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To turn the device screen off when closing _scrcpy_:
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```bash
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scrcpy --power-off-on-close
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```
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## Power on on start
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By default, on start, the device is powered on. To prevent this behavior:
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```bash
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scrcpy --no-power-on
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```
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