If you can't hear, he said the challenge is to speak English. REAL ENGLISH! Use this if you don't want to reveal your real voice: https://fakeyou.com/voice-conversion (PS: If you can't speak at all, or aren't fluent in English, use this one: https://fakeyou.com/tts )
Ends on 5/5 EDIT: Changed that date up there to 5/5 instead of 5/7 since almost everyone has done the challenge.