Improve your gum health up to 100% better than a manual toothbrush with the Protective Clean rechargeable electric toothbrush. It has a pressure sensor that protects teeth and gums from excess brushing pressure. Customize your own brushing experience with your choice. Our Brush ync technology tracks how long you have been using your Optimal Gum Care brush head and how hard you have been brushing. Your electric toothbrush will beep to inform you when to replace your brush head. The easy-start feature slowly increases the power of the brush as you get used to the Sonicare experience and the SmarTimer encourages a full 2 minute brushing time as recommended by your dental professional. The battery indicator light lets you know when it is time recharge.