Specifications: Product material:ABS Appearance size:3*3.2*24cm Vibration frequency: 40000 Waterproof grade: IPX7 Sound effect: 50db Power supply mode: USB Rechargeable Color:Pink/blue/white/black Number of nozzles : 4 Features: 1.40000 times/min high-frequency vibration deeply cleans the oral cavity, effectively removes tartar and dental stains, and achieves the effect of cleaning and whitening teeth.  2.Help you get rid of bad breath, improve yellow teeth and black teeth, and prevent tooth decay, swollen gums and other oral problems. 3.The round toothbrush head made of 0.01mm DuPont fine hair can rotate at 360°, which fits the radian of tooth surface and cleans teeth without hurting gums. 4.USB charging design, with a long battery life of 50 days after full charge, meeting your daily tooth cleaning needs.