1Carefully selected ABS material , it is durable, safe and healthy, and can be used with confidence. 2The micro switch automatically turns off when the time is up, easy to use. 3The product is small and portable and can be placed in a bag without taking up space. 4UVC-LED ultraviolet cleaning technology greatly reduces the chance of oral diseases, and is clean and hygienic. 5A pair of AAA batteries can be used about 4065 times and has a long service life.