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You can send an announcement to all of them. I have an old house and sound does not travel well. This gets used a lot in my home.

You can say “Alexa, announce dinner time.” or you can use the app to Write out a message. Additionally as mentioned above you can use the drop-in feature to speak with a specific device/room.

We have 7 echo dots (good grief). They are insanely inexpensive ($22 US) right now.

Lastly, they have motion/temp sensors which are helpful to shutoff lights/etc in empty rooms.