WhatsApp Help Center - About multi-device beta.
About multi-device beta -
The multi-device beta is an opt-in program that gives you early access to try a new version of WhatsApp for Web, Desktop, and Portal. If you join the multi-device beta, you’ll be able to use linked companion devices without the need to keep your phone connected. Your personal messages, media, and calls are end-to-end encrypted. Learn more about end-to-end encryption in this article.
Read in full here:
https://faq.whatsapp.com/general/download-and-installation/about-multi-device-beta/?lang=en
This thread was posted by one of our members via one of our news source trackers.