Amazon's Alexa can announce when there's a person or package at your Ring or Nest camera - The Verge
Amazon Echo - What it is; what it will be.
How to Use Alexa Like an Intercom: Drop In & Announcements
Doorbell Announcement Notifications Through Amazon Alexa – Ring Help
Alexa Announcements - "Time for Dinner" - YouTube
Alexa Announcements at CES 2016 : Alexa Blogs
Alexa Announcement Skill - Intercom Announcements to all Echos at once - YouTube
Alexa announce: How to broadcast your voice to all your Amazon Echo devices
How to Set Up Alexa Person and Package Announcement – Ring Help
Alexa Announcements einrichten und nutzen – So funktioniert's
Coursera Introduces Amazon Alexa Skill to Support Learning Goals - Coursera Blog
I keep getting an error whenever I try to make an announcement from the Alexa App. I can make announcements from one Echo to the rest, but not from the app. This