Didi driver, how do deaf people say to fasten their seat belts?

Didi driver deaf-mute will remind you to fasten your seat belt through the voice broadcast in the car. Because Didi's public comment focuses on the company's travel safety, the platform will also remind passengers to fasten their seat belts through in-car voice broadcast, so Didi's deaf-mute driver will remind passengers to fasten their seat belts through in-car voice broadcast. The voice broadcast of seat belt reminder on Didi platform exceeds10 billion times every year, and Didi.com also includes "reminding passengers to fasten their seat belts" into the driver service standard for supervision.