You can connect wireless accessories such as pair of headphones or a speaker or even a foot pedal for musicians. (goodereader.com)
Considering that my home office usually contains at least four active smartphones, multiple laptops, and various wireless accessories that typically could cause interference, that's good. (windowscentral.com)
Right next to the camera you'll find two connector pins which allow the Essential Phone to connect to wireless accessories such as the 360 camera. (androidauthority.com)