31,000 powerful sonic strokes per minute,Three modes: high/clean, soft/gentle, and massage. Powerful plaque remover where normal bristles can't reach. Effectively removes plaque without irritating gums. Gentle on teeth and gums. Removes even tough stains leaving naturally whiter teeth 4. 12 Brush heads included,Color-coded brush heads let families share the toothbrush base. 30-second alerts help users brush thoroughly,Automatically turns off after two minutes, 1 year warranty.