Sonic Electric Toothbrush Smart Toothbrush Ultrasonic Automatic Toothbrush USB Wireless Charging Adult Waterproof tooth brush S100 Main Features High cleaning frequency: max 39600 times/min Help to improve scientific brushing habit: automatically stopped for 0.5 second every 30 seconds, and automatically turn off while reaching 2 minutes ( a suggested the best brushing period ) Round brushing head and Dupond bristles : avoid hurt, deep cleaning includes dead corner IPX7 full body waterproof level for direct washing About 60 days duration ( 2min/time, 2 times every day ) Two-buttons design: one to choose cleaning modes, another to choose strength modes. 5 cleaning modes: Clean, Sensitive, Massage,White,Polish Wireless Charging Charging time: within 10 hours Package weight:550g (All Date From SAMO Technology Lab)