So long as your smartphone or tablet runs Android 6.0 Marshmallow or above and Google Play services 11.7+, it can use Fast Pair. The process bypasses the need to connect by fiddling with settings: Simply put a Fast Pair-equipped device in pairing mode and any Android phone or tablet will get a prompt to connect.
Thus far, only the Google Pixel Buds and Libratone’s Q Adapt On-Ear have Fast Pair equipped, and soon on Plantronics Voyager 8200. Fast Pair functionality is currently rolling out to Android 6.0+ devices.
social experiment by Livio Acerbo #greengroundit from https://www.engadget.com/2017/10/31/android-fast-pair-will-quickly-connect-bluetooth-devices/