About

The Android Beta Program gives you an opportunity to try out pre-release versions of Android and provide feedback. Devices that you opt-in to the program will receive an over-the-air (OTA) update to the latest beta version of Android. The updates that you'll receive as a part of this program are pre-release versions and may contain errors and defects that can affect the normal functioning of your device (see known issues).

Further reading: https://g.co/androidbeta