Double fine brush the dirt in one minute time maintain about 11000RPM vibration, better clean thorough cleaning between gums. Only need to replace the double-fine brush, more affordable. Fine brush tip portion is siliceous brush, brush better than regular massage gums. Clean the back of the protruding parts of the toothbrush, can effectively remove bacteria on the tongue. Inductive charging, waterproof. Suitable for home, traveling or other.