The Sonicare DiamondClean Smart 9350 toothbrush is a complete system for a healthier mouth. Designed to operate with the Sonicare app (Apple or Android), which keeps track of your brushing habits and personalizes your brushing experience. The HX9902 incorporates Smart sensors for pressure, scrubbing, and location readings. Smart Brush Head recognition detects the brush head being used and sets the intensity accordingly. It includes 2 Smart brush heads: Premium Plaque Control and Premium Gum Care. There are 4 cleaning modes: Clean, White, Gum Health, and Deep Clean+, and 3 intensity settings. The 14-day Lithium Ion battery recharges in the travel case or the charging glass.