Guard is an Alexa feature that helps you keep your home and family safe. When you set Guard to Away mode, if an Echo device detects the sound of smoke alarms, carbon monoxide alarms, or glass breaking, Alexa can send you Smart Alerts, via notifications to your phone. If you have a Ring or ADT Pulse security system, Alexa can also arm your system when you set Guard to Away mode, and you can opt to forward Smart Alerts to your security provider. And if you have connected smart lights, Alexa can automatically turn them on and off when Guard is in Away mode, to make it look like someone is home.