https://www.cnet.com/news/ahead-of-pixel-3-event-google-updates-usb-c-headphone-adapter/

We're expecting Google to announce its next-generation Pixel 3 phones on Oct. 9, but a better, faster dongle has surfaced early for your Pixel phone's pleasure. 

Google's store page says its upgraded $12 (£12) USB-C Headphone Adapter "now provides 38 percent more playback time and has a 53 percent improvement on plug-in latency than previously available Pixel 2 headphone adapter."