The Sonicare HX6321 is a Sonic toothbrush designed for kids ages 3 and up. Interactive fun for better brushing through the brushing app (Apple or Android). App includes brushing coach, tracking and motivation, and interactive learning. Choose from 8 fun designs to personalize your brush. 2 minute KidTimer. It includes 1 brush head which is also ideal for braces. The HX6321 is ready for travel with a compact charger and Universal Voltage. 90 day Money Back guarantee and 2-year warranty.