The Circuit for Gmail add-on integrates Circuit real-time collaboration features (www.circuit.com) into the Gmail app. 
Using the add-on, you will be able to:
- Create Circuit conversations from emails.
- Schedule real-time collaborations (voice, video, screenshare, whiteboard) in Google Calendar.
- Call any participant of your email either over Circuit or from Circuit to their phone numbers.
- View Circuit presence status.