How can I stop siren without opening the App ?

When you ran into your own alarm by accident you can use the widget or the button to stop the siren. For button you need to program the "Home Mode" on one of the clicks - for example double click. This would mean you come home - ran into your own alarm and double click to switch to home mode. This will stop the siren right away. Same occurs for the widget. When you ran into your own alarm you switch on your widget into home mode - you stop the siren.