To urgently get the attention of a person or a group, send a chime. Click on the chime icon on the right side of the text editor in any chat (figure 1). Except in direct chats, clicking to send a chime will show a confirmation screen before it is sent.
Figure 1 Click the chime icon to send
After a chime is received, the recipient hears an audible chime sound, sees a message in the chat, and receives a notification in the notification center as well as a desktop notification (if enabled).
Please note: A chime can only be sent to a chat with 30 or fewer members.