1# Power Management 2 3### Introduction 4 5This sample shows how to power off a device, restart the system, and check the screen status. 6 7### Usage 8 91. To power off a device, tap the **Power off** button, and click **OK** in the displayed dialog. To quit, tap **Cancel** in the displayed dialog. 10 112. To restart the system, touch the **Restart** button, and click **OK** in the displayed dialog. To quit, tap **Cancel** in the displayed dialog. 12 133. To check whether the screen is on or off, tap the **Check screen status** button. The check result will be shown in the displayed dialog. 14 15### Constraints 16 17This sample can only be run on standard-system devices. 18