151.3.2 Turning the Device OffPress and hold the Power button for about one second to display the following pop-up screen.Select the Power off menu to turn off the power.If the device stops its operation for a long time, press and hold the Power buttonfor about eight seconds to forcibly turn the device off.1.3.3 Standby ModeIf the device is not used for a long time, M3 SM15 automatically shifts to standby mode to decreasebattery consumption. To manually set the device in standby mode, lightly press the Power button.By default, if the device is not used for one minute or longer, it shifts to standby mode. The timewhen the device shifts to standby mode can be set by the user.Swipe the bottom Click Settings Display Sleep to change time that the device willshift to standby mode.