For kids aged 5+ or adults who prefer a smaller brush head Sonic Pulse Technology channels up to 9,000 high-intensity pulsations per minute 2x the sonic power Brush head combines silicone and PBT polymer bristles, strong on plaque but gentle on gums USB-chargeable, no charging dock required Compact, ergonomic, lightweight, ideal for travel Durable, hygienic materials last twice as long as nylon toothbrushes “Glee” and “Glum” Smile helpers encourage proper oral hygiene habits 100% waterproof, for regular use in bath or shower Every 30 seconds an interval timer prompts you to brush a new quadrant of the mouth