Washable(IPX7) Sonic Electric Toothbrush Waved surface Dupont bristles with 4 stuff wear indicator bristle;  Uniqe patented magnetic levitation brushless motor, over 31,000 strokes/min, makes 6mm wide swings on the bristle for effective cleaning; CE/EMC/FCC testing passed; USB inductive charger, with over-charge & discharge protection; 4-brushing mode: Clean, Sensitive, White, Massage, offer varying oral care needs;  2-minutes smart timer auto off with 30s reminder; Memory function set for used brush mode; Travel lock function: press and hold 5 second to lock or unlock, always unlock during charging; Red change to green charge indicator, red light flashing for low battery reminder; 800mAh Lithium battery, one full charge for up to 21 days using;