The extension augments your contact profile with social information.
It lets you enhance contact detail within Gmail.
You can create follow-ups within inbox.
You can manage open loops with: “Create a follow-up if no reply in 1 week.”
Read receipts feature lets you know who opened your email when.
You can track an email. This can be set to always on.
When the email is opened, you can get a real-time push notification to act on.