http://www.techradar.com/news/fast-pair-is-googles-answer-to-apples-painless-pod-pairing

Google has released a new feature that looks to take some of the shine off one of Apple’s most impressive features. Fast Pair allows for swift and easy pairing of Bluetooth headphones, much like the iPhone’s AirPod pairing method.

Fast Pair uses a combination of your phone’s location and Bluetooth Low Energy to discover Bluetooth devices that are sat near your phone. It then generates an image of the device and then allows you to connect with a simple tap of a button.