The Sonicare DiamondClean Smart 9750 toothbrush is designed to operate with the Sonicare app (Apple or Android) which keeps track of your brushing habits and personalizes your brushing experience. The HX9954 incorporates Smart sensors for pressure and location readings. Smart Brush Head recognition detects the brush head being used and sets the intensity accordingly. It includes 4 Smart brush heads: 1 Premium Plaque Control head, 1 Premium White head, 1 Premium Gum Care head, and a TongueCare+ head. There are 5 cleaning modes: Clean, White, Gum Health, Deep Clean, and Tongue Care and 3 intensity settings. The 14-day Lithium Ion battery recharges in the travel case or the charging glass. This Smart brush is Universal voltage. 90 day Money Back guarantee and 2 year warranty.