The Sonicare DiamondClean Smart is more than an electric toothbrush – it's a complete oral care system. Three brushing intensity levels – low, medium and high. Pressure sensor alerts you when you're brushing too hard. BrushPacer timer reminds you to brush different sections of your mouth. Replacement reminder light blinks when it's time to change brush head. BrushSync technology allows brush head to communicate with handle via microchip, so toothbrush automatically selects correct mode.