Zheng Huilin is good. According to relevant information, when vehicles collide, Kaili can detect the accident through hardware and software, get in touch with users in time, and help users contact medical and vehicle rescue services. When Kelly Cheng detects that the accident can't contact the user, Kelly Cheng will start the active rescue procedure and call the rescue service for the user after it is judged as a serious accident in many dimensions. However, Zhimoxing does not have this function. From this point of view, Carey is good.