This looks interesting......
https://www.engadget.com/2017/10/04/google-pixel-buds-translation-change-the-world/
https://www.engadget.com/2017/10/04/google-pixel-buds-translation-change-the-world/
But if you tell it to "Help me speak Japanese" and then start speaking in English, the phone's speakers will output your translated words as you speak them. The other party's reply (presumably in Japanese because otherwise what exactly are you playing at?) will then play into your ear through the Pixel Buds. As Google's onstage demonstration illustrated, there appeared to be virtually zero lag time during the translation, though we'll have to see how well that performance holds up in the real world with wonky WiFi connections, background noise and crosstalk.