Sound Alerts appears in the panel area below the video player and remains active even when the channel is not live. Users will not be able to see and plays sound buttons, except for the broadcaster.
When the viewer hovers of the video player an extension sidebar will appear where Sound Alerts can be opened and closed on top of the stream. Only visible when the stream is live.
Sound Alerts can always be opened inside the Twitch mobile app. Viewers can play alerts and use Bits in the extension just like on Desktop.