?Safety charging?Hidden charging port design can not be opened easily by children to ensure safety. Built-in rechargeable battery. ?Soft Bristle for Kids? Thoughtful brush head design - 0.152mm round-ended DUPONT bristles are adopted to provide gentle cleanness to teeth without hurt the enamel and gum. "W" shaped bristles ensured cleanness of every corner of your teeth. The small size of the head further allowed the flexible move of the brush while cleaning. ?Use Tips? Wash toothbrush and brush head after used. Clean the shaft atleast once a week. It is suggested to replace the brush head every 3 months for the sake of oral hygiene. Keep the toothbrush body dry while charging. It can last for 20 days after six hours of charging. ?Intelligent Mode Memory? After using for more than 30 seconds each time, the mode will be automatically memorized and automatically jump to the next time you turn on the machine. There are three modes, including cleaning mode, whitening mode and massage mode, so that your child has more choices. ?Scientific & Interesting Brushing?It is suitable for children aged 3-14. Long press for three seconds to turn on or off the music. 2 minutes of intelligent timing, every 30 seconds to switch an interesting music, It plays 4 children's singing songs, "Brush Brush Brush", "Jingle Bells", "Merry Christmas" & "If You Are Happy".remind children to change the area of brushing teeth, ensure the uniform cleaning of every part of the mouth, help children to develop the good habit of brushing teeth.