As for the Student Party, I think the H9 electric toothbrush of BYCOO's family is good, easy to use and inexpensive. It cost more than 300 yuan when I bought it before. I have used it for more than a year, and it is very cost-effective. The Philips electric toothbrush I used before was always lifeless, loud and uncomfortable to use. Better than BYCOO's H9 electric toothbrush, small and fresh, very suitable for the student party.