Megaphone is a feature that lets you speak to everyone in the main room. There is also a feature that allows Admins and Moderators to broadcast a message to all breakout rooms at the same time. This button is located at the bottom panel.
This feature can be helpful when you need to make a quick announcement to all participants in all breakout rooms (excluding the main room). Keep in mind that you will not be able to receive any feedback on this channel. To use the feature, simply click on the broadcast button at the bottom panel. You will be asked to confirm before the broadcast begins. Please note that while the broadcast is active, you will not be able to hear anyone in the breakout rooms.
When you start broadcasting, your image will be shown in every room and every participant in the upper left corner of the screen.
*This feature is currently not supported in all browsers. List of supported browsers is here.