
Google also provides the ability to turn off Knock Knock if you prefer not to use it.

Knock Knock: The Knock Knock feature lets the recipient of a call see a live preview of the caller before accepting the call - so you can see who is calling you, what they look like, and even where they are before you choose to answer.With Family mode, you can create on-screen doodles to share with others on the video call. Special effects: During video calls, you can add augmented reality effects to your face, similar to Instagram.

End-to-end encryption: All messages and calls on Duo are end-to-end encrypted, which provides an added layer of security.Messages and calls: You can record short voice or video messages to send to select contacts, and you can choose to make audio-only calls as well.Voicemail: If the person you're calling doesn't answer, you can leave a video message for them.Wi-Fi calls or cellular network calls: The app automatically switches between your cellular network and Wi-Fi, and when your connection allows, it will use the highest quality video available - 720p HD on most devices and 1080p HD on the Samsung Galaxy S20 and above.Google Duo has a number of notable features, including:

At the bottom, select a type of message to record.
