The heart of the process is Waverly’s app, which both and your friend need to download onto your phones (it’s free on both iOS and Android). Then, once you “sync” your conversation through a matching QR code on the app, you’re off and speaking. Press a button on the app and talk into the earpiece’s microphone to record what you want to say. Your voice is then piped through Waverly’s machine translation software which converts it to text on your friend’s app. If he also has his own earpiece, your friend will hear a translated version of what you said, albeit via a computer voice.
Language barrier issues won’t go away completely for years but will be significantly different.