Feature: Advanced sonic cleaning technology,produce≥16,000 strokes/min dynamic cleaning action. 2 minutes auto-timer ensures dentist recommended brushing. 30 seconds interval time helps to brush each area of your mouth. White LED light help Mother to observethe growth of baby's teeth . Extremely soft DuPont bristle,better care baby’s teeth. Cute design bring more fun when brushing. One battery can last for 120days (twice of 2mins per day).