High cleaning frequency: up to 31,000 times / minute Help improve scientific brushing habits: Smart Shake reminds you to change the brushing area and automatically closes when it reaches 2 minutes (the recommended best brushing time) Round brush head + curved brush surface: avoid injury, deep cleaning including dead angle IPX7 body waterproof rating, can be washed directly Speed: 31,000 times / minute or 27,000 times / minute Charging time: 16h Package contents: 1 x electric toothbrush, 1 x toothbrush base, 1 x Chinese manual