Request and Response JSON Reference | Alexa Skills Kit

If the device has a screen and the skill displays screen content, the session stays open for up to 30 more seconds, without opening the microphone to prompt the user for input. For details, see How devices with screens affect the skill session. If the user speaks and precedes their request with “Alexa,” Alexa sends the request to the skill …

https://developer.amazon.com/en-US/docs/alexa/custom-skills/request-and-response-json-reference.html