Choose the default function that will be undertaken when the powerkey on your remote is pressed.
Sleep now: Puts your device in sleep mode. When you press the power button again, your device will wake and you will be at the same screen as you were previously.
Shutdown: This option powers off your VBox and shuts it down completely. When you press the power button on your remote again, your VBox will boot up and you will be taken to your home screen.
Restart: Restarts your device and brings you immediately to your home screen.