Smart design, it will remind you to change the palce your brush after brushing teeth for 15 seconds and will finishing teeth brushing automatically after brushing your teeth for 2 minutes, protecting your gum from damage caused by brushing the same 4 Brush heads for replacement, they are in 2 different shapes, soft and comfortable to use, safe to human body, you will love the feel while brushing your teeth. Powerful and effective, it has 5 modes and 15 speeds, its vibration speed can reach to 38,000rpm, you can choose the mode and intensity you need to play with. Stylish and sleek, with a perfect size, it's light and won't be too large to be comfortably held in hand. Meanwhile, it's portable and great for daily and travel. USB Rechageable, IPX7 waterproof, this toothbrush kit will be a great option for your daily teeth cleaning and teeth care.