Unfortunately, it doesn't seem that third-party Alexa-enabled devices will enjoy the same functionality, which is common for some of the Echo's best features.
Amazon wants to make your life easy if you have Alexa-powered speakers and hate walking up to every room to call everyone for dinner.
An Echo owner could say "Alexa, announce", and then everything said after would play in the other Echo devices.
There are also sound effects that can trigger and accompany your announcements. If so, Amazon's latest feature for Alexa is for you. Amazon key is expanding to work with five additional smart locks today, Kwikset is adding three new models today, and Yale is adding two.
Rolling out to Echo devices in the USA and Canada today, the new feature lets you broadcast a message to multiple Echo speakers at once. As with other Alexa features, we can expect to see Amazon gradually roll Announcements out more widely in the coming weeks and months.
It is a bit similar to the Drop In feature that lets a user connect instantly to another Echo device and communicate with whomever is within earshot of that particular Amazon Echo device. You can also say "Alexa, broadcast", and again, tack on your voice message at the end.
To be able to use this, you need to assign all the Echo speakers to one household profile.
The newest feature is now available across all Echo devices in the United States and Canada.